Answer:
Explanation:
D
A researcher attempts to use a segment of ribosomal RNA as a molecular clock to calculate the date of the last common ancestor of two species. He finds that the two species diverged from a common ancestor 150 million years ago. These particular species have abundant fossil records that strongly suggest that these species diverged 100 million years ago. Which of the following answer choices best describes a reason for the discrepancy in the date of the last common ancestor of these species?
A. Ribosomal RNA is not a reliable molecular clock and should not be used for dating.
B. The neutral mutation rate used in calculating the last common ancestor date may not have been accurate.
C. It is highly likely that the two organisms did not share a common ancestor, so the results are invalid.
D. A large portion of the ribosomal RNA is not vital to survival, so it is not likely to be well preserved.
Answer:
B
Explanation:
It is B because the mutation rate should not have been accurate if it showes that they diverged 150 million years ago. But the abundant fossil records show that it diverged 100 million years ago.
Hope this helps:)
Ribosomal RNA is not a reliable molecular clock and should not be used for dating.
What is molecular docking?In structural molecular biology and computer-assisted drug design, molecular docking is an important technique. The purpose of ligand-protein docking is to anticipate a ligand's most common binding mode with a protein having a known three-dimensional structure.What is dating? Carbon dating is used to determine the age of ancient material such as an archaeological or paleontological specimen .A molecular clock estimates how long it has been since similar species separated from a common ancestor based on DNA sequences (or the amino acid sequence of proteins encoded by DNA).
Hence, the correct option is A.
To know more about molecular dock here
https://brainly.com/question/1255417?
#SPJ2
which example best describes how an X-ray machine works?
20 A QUESTIONS
O
Switching a flashlight on and off to transmit a message
0
Removing the batteries from a flashlight to keep a room dark
O Putting your hand in front of a flashlight beam to make a shadow
O
Shining a flashlight beam on a mirror to brighten a room
SUBMIT
Explanation:
putting hand in front of flash light
Answer: C
Explanation:
I just answered the question on a p e x
Sam doesn't feel like he's being treated fairly by his parents. He wants to stay out
later, but they want his curfew set at 10PM. What is causing this conflict?
dispute over resources
differing values
Opower struggle
Omiscommunication
Answer:
c. power struggle
hope this helps
In the 2 sentences or less how can we solve global warming
Explanation: We can turn of the lights when were not using them and use bike rids instead of car rides use solar panels.
What is something that happens when you change the wavelength?
Answer:
efd
Explanation:
imk a black ni gge r
7. Which of the following is NOT found in bacteria? *
a) Cell wall
b) Membrane bound nucleus
Ribosome
d) Plasma membrane
In a co-dominant type of inheritance, a heterozygous A blood type female
is crossed with a homozygous B blood type male. What are the chances of
producing an offspring that is A blood type?
0%
25%
50%
75%
Answer:
0%
Explanation:
The ability to do work or cause change is called
energy
O force
O power
Owork
Answer:
energy
Explanation:
which of the following is a renewable resource?
A. Sunlight
B. Natural gas
C. Copper
D. Coal
Answer:
Out of the following, the renewable resource is Sunlight.
I think the right answer is Sunlight.
Additional Information:
Those resources which can be reuse again and again is called renewable resources
Hope it will help
Natural selection is affected by which three factors? A. reproduction B. evolution C. variation D. overproduction E. mechanism F. competition
Natural selection is affected by evolution as three factor. The correct options are A, B and C.
Thus, Natural selection results in the transmission of advantageous genetic variants through reproduction.
As a result, a new generation of organisms emerges that has a higher chance of surviving and reproducing.
For instance, giraffes have an edge over other species due to their long necks, which have allowed them to graze on leaves that others cannot reach.
Because they had access to greater food, those with longer necks were able to breed and pass on the trait to the next generation. Less likely to survive and pass on their genes would be those with shorter necks and access to less food.
Thus, Natural selection is affected by evolution as three factor.The correct options are A, B and C.
Learn more about Natural selection, refer to the link:
https://brainly.com/question/20152465
#SPJ6
Why do the cells inside of your stomach get replaced every few days , but other cells in your body can live for weeks, months or even years?
Answer:
hi, this is the answer of your question
the cells that line your stomach can renew as fast as every two days, because they in contact with digestive acid.
If the eyes and jaws of a corpse appear stiff, about how much time has likely
passed since death?
Answer:
between 1 and 6 hours and believe the average though is 2-4
Answer:
big gangs
Explanation:
PLEASE HELP I WILL BE GIVING THE BRAINLIEST AND 15 POINTS!!!!!!!!
The woolly mammoth was a relative of elephants that lived in the far north. There is much debate in the scientific community about what caused the extinction of mammoths. Climate models show that changing weather patterns stressed mammoth populations. Hunting by humans may have also reduced populations. The youngest mammoth remains on a continent are 10,000 years old.
A group of scientists is trying to bring mammoths back by modifying elephant DNA. The new animals would have a mixture of elephant and mammoth genes. What will be the effect of the new genes?
A. The new genes will produce different proteins.
B. The new genes will prevent DNA replication.
C. The new genes will require gene therapy.
D. The new genes will not have RNA.
Answer:
C
Explanation:
Because when new genes are created they won't be able to adapt easily, so they will require gene therapy so they will be able to adapt easier.
Hope this helps you. :)
Have a good day!
The new genes will produce different proteins. Therefore, option (A) is correct.
By modifying the DNA of elephants to include mammoth genes, the scientists aim to introduce genetic variations that were present in the woolly mammoth. These genetic variations would result in the production of different proteins compared to the proteins produced by elephants.
Proteins are essential molecules that perform a wide range of functions within living organisms, including structural support, enzymatic activity, and regulation of biological processes. Therefore, the introduction of new genes from mammoths would lead to the production of different proteins, potentially affecting various traits and characteristics of the modified elephants.
Learn more about proteins, here:
https://brainly.com/question/30986280
#SPJ4
Why is it essential that threatened
species compete for resources successfully
Answer:
Organisims compete to survive, like food, shelter, water amd more that is why it essential that threatened species compete for resources successfully
HELP ASAP i need this to pass my grade
this is for science, and if i get the questions right, I pass, but the teacher never taught us the lesson, idrk y. so i really need help:( Im giving away 11 points so please give me your best answers ;)
1. As an astronaut travels from the surface of Earth to a position that is four times as far away from the center of Earth, based on the Law of Gravity which of the following statement is true?
a. mass remains the same and the gravitational pull from Earth decreases
b. weight remains the same and the gravitational pull from Earth changes
c. weight increases and the gravitational pull from Earth stays the same
d. mass decreases and the gravitational pull from Earth increases
2. A satellite is sent into orbit around the Earth, In which of the following situation would the gravitational force be the greatest?
A. 1200 lb satellite orbiting 150 miles above Earth’s surface
b. 850 lb satellite orbiting 150 miles above Earth’s surface
c. 850 lb satellite orbiting 1500 miles above Earth’s surface
d. 1200 lb satellite orbiting 1500 miles above Earth’s surface
3. High and low tides are the regular pattern of rising and sinking ocean-water levels. They are caused when the sun’s gravity and the moon’s gravity pull on ocean water. The moon’s gravity has a greater effect on Earth’s oceans than the sun’s gravity. Why would the moon have a greater effect than the sun?
a. The moon has less mass than the sun.
b. The moon is closer to Earth than the sun.
c. The moon is not as hot as the sun.
d. The moon has less mass than Earth.
4. Which statement about the universality of gravity is false?
a. The gravitational force between two objects depends only on their masses.
b. Any two objects that have mass also have a force of gravity acting between them, no matter how far apart they are.
c. The gravitational force between two objects increases if the objects move closer together.
d. The gravitational force between two objects increases if mass is added to one object.
How can you decrease the effort force needed to push a weight to the top of the ramp? A) cover the surface with carpet B) increase the length of the ramp C) increase the height of the ramp D) decrease the length of the ramp
Answer:
B) increase the length of the ramp
Explanation:
Less force is needed to move the object over a longer distance.
Answer:
You can decrease the effort force needed to push a weight up the ramp if you increase the length of the ramp. You could also decrease the height of the ramp.Lengthen the ramp, decrease the mass of the object, use a machine can you decrease the effort force needed to push a weight
Explanation:
A ramp is an example of an inclined plane. Think back to the example of the ramp and the moving truck. The ramp reduced the amount of force needed to lift the box by moving it over a greater distance. The longer an inclined plane, the less force is required to move an object upward.
Which of the following ecological levels is correctly paired with its description?
A) Organism - all of the species living in a given area
B) Community - a group of one species living in a given area
C) Population - the regions on Earth that can support life
D) Ecosystem - all of the living and nonliving factors in an environment
E) Biosphere - anything that meets all of the characteristics of life
The correctly paired ecological level with its description is the option D. Ecosystem - all of the living and nonliving factors in an environment, among given options.
An ecosystem is a geographic region or area where all the living factors including animals, plants, bacteria, and others interact with all the physical or non-living factors such as landscape, humidity, water, and many more.
Other given ecological level and their description:
Organism - an organism is the living being that is the simplest form of ecological level composed of organ systems.Community - It is a population with similar characteristics that live in a particular area.Population - a group of members of a particular species living and interbreeding within a given area.Organisms > Population > community > ecosystemThus, the correct answer would be option D.
Learn more about ecological level:
https://brainly.com/question/1323075
Given the following phylogenetic tree, which evolutionary event occurred most recently?
A.) development of different forms of symmetry.
B.) development of tissues.
C.) each of these traits evolved at the same time.
D.) protostome and deuterostome development.
Answer:
Option-D
Explanation:
A phylogenetic tree is a diagrammatic representation which is constructed in to show the common ancestors at the base of the tree and the branches represent the new species.
The phylogenetic tree which is constructed based on the traits evolved during evolution is known as a cladogram. In the given question, the cladogram represents the evolution of various groups of the organism from a common ancestor based on the traits evolved.
The trait which was evolved earlier is present at the base like the development of tissues while the most common trait is present at the top which is the development of deuterostome and protostome.
Thus, Option-D is the correct answer.
which statement would most likely be used to describe variation
Answer:
"Variations that decrease reproductive success are more likely to be passed on" is the one statement among the choices given in the question that would least likely be used to describe variation. The correct option among all the options that are given in the question is the second option or option "B".
Explanation:
Answer:
Variations that decrease reproductive success are more likely to be passed on" is the one statement among the choices given in the question that would least likely be used to describe variation
what is the main factor in the poor health of undeveloped countries?
a. too few doctors
b. more imports than exports
c. industrial pollution
d. infectious disease
the answer is A.Explanation:
match each term to its definition
Answer:
Solar Wind --> a stream of charged protons and eletrons
Solar Prominence --> A violent explosion
Gamma Ray Proton --> energy released
<3 * hope this helps! * <3
Answer:Solar Wind --> a stream of charged protons and eletronsSolar Prominence --> A violent explosionGamma Ray Proton --> energy released
Explanation:
Piyush is asked to classify samples of bacteria as bacilli, cocci, or spirilla.
Which is the most useful strategy for him to follow?
A. Analyze the DNA of the bacteria.
B. Raise colonies of the bacteria in several growth media.
C. Use a microscope to observe the shapes of the bacteria.
D. Use a microscope to observe the colors of the bacteria.
Answer:
C.Use a microscope to observe the shapes of the bacteria.
Explanation:
Bacteria is a type of pathogenic micro-organisms. They are mostly known to cause diseases and can be viewed using an electron microscope.
Bacteria have different shapes and colors. The shapes include bacilli(rod shaped), cocci(spherical)or spirilla( twisted).
The most useful strategy will be to use a microscope to observe the shapes of the bacteria.
The motion of an object can be described by its
OA. speed.
OB. position.
OC. direction
OD. all of these
Answer: the correct answer is d) all of these . here so the other person can get brainlest . have a good day/ night!!
Explanation:
Help please I need a. and b. For number 2
Answer:
they are both dominant
Explanation:
because of the capital P overrides tge lowercase p
Answer:
PP = purple and Pp = purple
Explanation:
Purple is dominant in both genotypes.
Mining leads to a reduction in
because it destroys
by uprooting forests and demolishing mountainsides.
Answer:
Your answer is rainfall.
Answer:
biodiversity
habitats
Explanation:
plato
Indicate whether or not the following functions are performed by the excretory system.
____excreting waste materials
____excreting blood
____maintaining pH balance
____maintaining body temperature
____maintaining salt balance
____maintaining hormone levels
____maintaining water balance
Answer:
1. yes
2. no
3. yes
4. yes
5. yes
6. no
7. yes
Only excreting blood is the function that is not performed by the excretory system.
What do you mean by the Excretory system?
The excretory system may be defined as the system that consists of a pair of kidneys, ureters, and urinary bladder. It removes wastes from the body.
Excreting waste materials, maintaining pH balance, maintaining body temperature, maintaining salt balance, maintaining hormone levels (aldosterone), and maintaining water balance are all the functions that are performed by the excretory system.
Therefore, only excreting blood is the function that is not performed by the excretory system.
To learn more about the Excretory system, refer to the link:
https://brainly.com/question/1001081
Both rock and bodies of water are considered a type of
A) water
B) soil erosion
C) reservoirs
in cycles of matter. When rock is exposed for mining,
A) water
B) soil erosion
C) reservoirs
can readily transport nutrients from rock to aquatic
ecosystems. Runoff that carries excess nutrients can cause algae blooms.
The effects of
A) water
B) soil erosion
C) a reservoir
also increase water pollution and can
clog waterways.
Check
Answer:
c
a
b
Explanation:
Both rock and bodies of water are considered a type of reservoirs. Thus, option C is correct.
In cycles of matter when rock has been exposed for mining, the answer is water. Thus, option A is correct.
Can readily transport nutrients from rock to aquatic ecosystems. Runoff that carries excess nutrients can cause algae blooms.The effects of soil erosion. Thus, option B is correct.
What is soil erosion?The removal of the top of the soil by water, wind and human activities has been called soil erosion. The reason due to which soil erosion takes [place is that trees should be planted in several rows to check the speed of the wind. This reduces soil erosion because of wind. Because the rivers cause soil pollution, dams are built in the upper course of the rivers to check soil erosion.
Soil erosion has happens when the dirt has been exposed to the high winds, heavy rains, and rushing water. In few circumstances, human activities, like farming and land clearance, expose soil to erosion. Soil erosion has been considered as the removal and transfer of the top layer of soil from its original location to another due to high winds and fast-running precipitation.
Therefore, Both rock and bodies of water are considered a type of reservoirs. Thus, option C is correct.
In cycles of matter when rock has been exposed for mining, the answer is water. Thus, option A is correct.
Can readily transport nutrients from rock to aquatic ecosystems. Runoff that carries excess nutrients can cause algae blooms.The effects of soil erosion. Thus, option B is correct.
Learn more about rock on:
https://brainly.com/question/19930528
#SPJ2
Using the graphic provide, identify the products of photosynthesis.
A) sunlight oxygen, water
B) sugar ( glucose ), oxygen
C) sunlight, water, carbon dioxide
D) sunlight,carbon dioxide, water
Answer: C
Explanation: The carbon dioxide enters the leaves of the plant through small pores called stomata. ... The plant uses sunlight as energy to perform this chemical reaction. Photosynthesis separates carbon dioxide and water — known as CO2 and H2O, respectively — into their individual molecules and combines them into new products.
Answer:
guys c) was wrong the answer was b)
Explanation:
Which of these is not an environmental effect of building dams?
A. increased water temperature
B. soil erosion upstream
C. weed growth downstream
D. reduced fertility downstream
Please help!!! Am taking unit test!! Should give 23 points!
Answer:
C
Explanation:
Which of the following lists the order of taxonomic levels from the largest to the smallest group?
domain, kingdom, class, order, family, phylum, genus, species
species, genus, family, order, class, phylum, kingdom, domain
class, family, order, domain, kingdom, phylum, genus, species
domain, kingdom, phylum, class, order, family, genus, species
Answer:
domain, kingdom, phylum, class, order, family, genus, species
Explanation:
which is d on edge 2021 :)
Domain, kingdom, phylum, class, order, family, genus, species is the correct order of taxonomic levels from the largest to the smallest group.
What is taxonomy?Taxonomy is a branch of science which deals with the classification of organisms on the basis of similarities and differences. It starts from domain and ends with species so we can say that domain, kingdom, phylum, class, order, family, genus, species is the correct order of taxonomic levels from the largest to the smallest group
Learn more about taxonomy here: https://brainly.com/question/1304906
