Answer:
For the bones of wolves trapped 28,500 years ago, the approximate ratio of carbon-14 to carbon-12, 14C to 12C, will be one part per 32 trillion.
Explanation:
Radioactive isotopes of elements are useful for many purposes. Carbon has three isotopes, carbon-12, carbon-13, and carbon-14. Of these, carbon-14 is radioactive.
The half-life of an carbon-14 is used to determine the age of fossils in a process known as carbon-dating.
Carbon-14 has a half-life of approximately 5700 years. The half-life being the time for half the amount of the radioactive nuclei present in a radioactive element to decay.
The number of half-lives in 28500 years = 28500/57000 = 5 half-lives
This means that the original amount of atoms present in the atoms has undergone radiactive decay five times.
The ratio of the original amount of 14C to the present amount of 14C = (1/2)⁵ = 1/32
Ratio of 14C to 12C that will be found in the bones = 1/32 × 1/ 1 trillion = 1/32 trillion.
Therefore, for the bones of wolves trapped 28,500 years ago, the approximate ratio of carbon-14 to carbon-12, 14C to 12C, will be one part per 32 trillion.
Which of the following findings would lead you to determine that an infant's airway is open
Answer:
blowing air into his/her mouth and checking for an increase in the thoracic region........I GUESS
Which of the following is true
about true-breeding plants if they are allowed to self-pollinate?
A. They never have offspring with the same traits as the parent plant.
B. They have offspring with traits that are identical to the parent plant with one or two differences.
C. They always have offspring with traits identical to the parent plant.
Answer:
b
Explanation:
some are the same while others are different (traits)
When curare, a neuromuscular poison, is dropped onto an isolated muscle-nerve preparation in a laboratory, the muscle does not contract when the nerve is stimulated, even though neurotransmitter is released from the nerve cell. Why does this happen
Answer:
Explanation:
Whenever the nerve terminal's action potential depolarizes, calcium enters the cell through the channels. Calcium allows acetylcholine (ACh) to be released more easily. These ACh molecules subsequently circulate into the synaptic cleft and attach to the motor end-plate of the nicotinic cholinergic receptors. Acetylcholine molecules connect to nicotine ion-channel receptors present on cell membrane the of muscle cells, enabling the ion channels to open. Calcium ions then enter the muscle cell, kicking off a series of events that eventually result in muscular contraction.
Curare is a kind of neuromuscular relaxant blocker that is non-depolarized in nature. Nondepolarizing muscle relaxants work as competitive agonists, binding to ACh receptors but failing to activate ion channels. As a result, they inhibit ACh from bonding, preventing the development of endplate potentials and inducing muscle paralysis.
Gina is lactose intolerant but she loves to eat cheesy fries from her local restaurant. What do you suggest Gina does differently so she gets the same nutrients but does not suffer with the bloating and pain she feels after eating cheesy fries?
a. Eat a smaller portion of fries and order a cup of vegetable soup.
b. Add jalapeño peppers to the fries since the spice will counteract the effects of the dish.
c. Order macaroni and cheese instead.
d. Ask for a low-fat cheese option
Answer:
A
Explanation:
Its the most logical one
Excess postexercise oxygen consumption (EPOC) is also known as oxygen debt.
a. True
b. False
Answer:
True.
Explanation:
Excessive postexercise oxygen consumption can also be called oxygen deficit. It occurs after an individual completes a physical activity. Physical effort does not allow oxygen consumption to be normalized as soon as the body comes to rest and for this reason, the body begins to breathe and demand oxygen more intensely. This moment is known as excessive postexercise oxygen consumption, or oxygen debit. The intensity of breathing at this time will depend on the physical effort made, the weight loss and the increase in total caloric expenditure.
Select the correct answer.
How does the high specific heat of water help maintain the temperature of earth?
A By heating and cooling more slowly than land or air
B. By heating and cooling faster than land or air
с.
By heating faster but cooling more slowly than land or air
The high specific heat of water help maintain the temperature of the Earth by heating and cooling more slowly than land or air. Thus, the correct option is A.
What is the specific heat of water?The specific heat of an object is the amount of heat which is required to increase or raise the temperature of unit mass of that particular substance through one degree celsius. Specific heat is represented by the symbol 'c'. Its unit in SI system is Joule /(kg °C) and in CGS is cal / (gm °C).
The high specific heat of water helps in regulating the rate at which air changes its temperature, which is why the temperature of the planet change between different seasons is gradual rather than sudden, especially the geographical locations near the ocean.
Therefore, the correct option is A.
Learn more about Specific heat here:
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i)
State why the cobalt chloride paper is kept in a jar with a ground glass
stopper
Answer:
bcz it is harmful for human body
Explanation:
•. otal genomic structure of an organism inherited from parents is known as -
a) Gene
b) Allele
c) Phenotype
d) Genotype
What is the role of RNA?
Answer:
It is the 1st one ○ to provide the original blueprint for protein production
Explanation:
RNA polymerase (green) synthesizes RNA by following a strand of DNA. RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, duyring the process of transcription.
The graph below shows the changes in the number of species in an ecosystem
Species Diversity
300
200
Number of Species
|..
100
و 12 19 0
1989
1994
1980
Year
Which event was most likely the cause of the changes in species diversity in this ecosystem?
A large volcanic eruption
B A flash flood
Amatorado
D Amigration of cuts
Which of the following is the correct order of events?
Select one:
a. Germination, pollination, growth of a pollen tube, fertilization
b. Fertilization, growth of a pollen tube, germination, pollination
c. Growth of a pollen tube, pollination, fertilization, germination
d. Pollination, growth of a pollen tube, fertilization, germination
Answer:
growth of a pollen tube ,pollination ,fertilization ,germination
Which gas is exhaled along with used air?
SCIENCE QUESTION... ☺️
Explanation:
When we take a breath, we pull air into our lungs that contains mostly nitrogen and oxygen. When we exhale, we breathe out mostly carbon dioxide.
Some microorganisms cause human disease. Other microorganisms are used in making cheese, yogurt, and bread. Based on this information, the relationship between humans and microorganisms can be
A) beneficial, only
B) harmful, only
C) beneficial or harmful
animal modified for climbing are called
The membranes that enclose and protect the
The external physical appearance of an indivi
B
A blood clotting disorder, occurring mainly in
recessive gene on the X chromosome.
4
An allele that is not expressed in the phenoty
heterozygous condition.
5 Changes that occur in the diameter of the pu
conditions.
Puplary mechanism
Answer:
B
Explanation:
information of vertebrates mammal
Answer:
A vertebrate is an animal with a spinal cord surrounded by cartilage or bone. The word comes from vertebrae, the bones that make up the spine. Animals that are not vertebrates are called invertebrates. Vertebrates are adapted to life underground, on the surface, and in the air. They feed upon plants, invertebrate animals, and one another. Vertebrate faunas are important to humans for food and recreation.Vertebrate Classes
Agnatha (Jawless Fish) Aves (Birds) Amphibia (Amphibians) Chondrichthyes (Rays, Sharks, Skates) Mammalia (Mammals) Osteichthyes (Bony Fish) Reptilia (Reptiles)
Explanation:
Luke was Isked to find the median of the following
numbers:
16, 24, 12, 7, 30, 11,22
The work below shows the steps he used.
X X 16 22 24 30
What error did Luke make?
O He forgot to put the numbers in order first.
O He crossed off the low and high pairs incorrectly.
O He left out a number when putting the numbers in
order.
O He did not make an error.
16 + 22 = 38
2 2
16 22 = 38
19
Answer:
He left out a number when putting the numbers in order.
Explanation:
To find the median of a set of numbers, first arrange the numbers in order from least to greatest. Then begin crossing numbers of from each side at the same time.
Luke did not cross numbers off from each side, but only crossed them off from the left side. He also skipped a number, given there are only 2 "X's."
The list should look like so:
7, 11, 12, 16, 22, 24, 30
There should be three numbers before 16, not two as he has listed.
what are some of the actions that the somatic nervous system does?
Which of the following techniques employs a probe consisting of a labeled, single-stranded DNA of known sequence that can find and bind to a complementary sequence present in a large sample of different DNA sequences?
a. DNA hybridization
b. RFLP
c. PCR
d. DNA sequencing
Answer:
Explanation:
PCR
14. What do the embryos of different vertebrate species have in common?
Answer:
Similarities in embryos are evidence of common ancestry. All vertebrate embryos, for example, have gill slits and tails. Most vertebrates, except for fish, lose their gill slits by adulthood.
Explanation:
itz from gologolo lol I hope it helps uh
keep smiling #smilies
2. Would a footprint be considered a fossil?
Answer:
yes i think so
Explanation:
Which nutrient cycle has NO atmospheric (gas) form
A) Carbon
B) Nitrogen
C) Phosphorus
D) Water
Answer:
c.) phosphorus
Explanation:
it can be found in the atmosphere as very little dust particles
How many kinds of mosquito are common in Nepal l
there are 130 kinds of mosquito are common in Nepal l
A cell has twice as many mitochondria as a typical cell. It also has a large amount of rough ER. What functions
might that cell have?
Answer:
below
Explanation:
A chain of monosaccharides is called a _________.
A. quasi-saccharide
B. multisaccharide
C. polysaccharide
D. glucose molecule
Answer:
C. polysaccharide
Explanation:
^_^^_^^_^
how many homologous pairs of chromosomes are present in a haploid cell that has 8 chromosomes and is in anaphase II of meiosis ll? explain your answer
Answer:
In many ways, meiosis is a lot like mitosis. The cell goes through similar stages and uses similar strategies to organize and separate chromosomes. In meiosis, however, the cell has a more complex task. It still needs to separate sister chromatids (the two halves of a duplicated chromosome), as in mitosis. But it must also separate homologous chromosomes, the similar but nonidentical chromosome pairs an organism receives from its two parents.
These goals are accomplished in meiosis using a two-step division process. Homologue pairs separate during a first round of cell division, called meiosis I. Sister chromatids separate during a second round, called meiosis II.
Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, anaphase, and telophase.
Which food has the greatest amount of polyunsaturated fat?
What is a plant nucleus
Answer:
All plant cells contain a nucleus, a structure that stores DNA and acts as a cell's command center. It is surrounded by the nuclear envelope and is filled with nucleoplasm. ... DNA is copied during DNA replication for new cells, as well as copied to RNA to make proteins in the nucleus.
Phân tích các yếu tố cho thấy ĐẤT là môi trường đa dạng nhất về các loại sinh vật?
.... what you wrote isn’t a question.... you wrote a statement.....
Here is what you wrote translated to English
Analysis of factors shows that SOIL is the most diverse environment in terms of organisms?
Answer:
I don't no answer sorry
Explanation:
follow
A phosphate group has the following chemical composition:
a. -OH
b. -COOH
c. -PS2
d. -CH3
e. -PO4
Answer: The phosphate group has the chemical composition [tex]-PO_{4}[/tex].
Explanation:
A phosphate group is a group where one phosphorus atom is attached to four oxygen atoms.
The oxygen atoms are attached to the phosphorus atom via single bond and one oxygen atom is attached to the phosphorus atom via double bond.
The chemical formula which represents a phosphate group is [tex]-PO_{4}[/tex].
Thus, we can conclude that phosphate group has the chemical composition [tex]-PO_{4}[/tex].
