Answer:
There are many theories
But main evidences are
Fossils of Plants animals and other organisms who lived on this planet at sometime. Oprain And Halden theory which suggests the chemical and biological evolution.5.Do the differentiated teeth of the dolphin have specialized functions like our teeth and most other mammals
Answer and Explanation:
Dolphins are homodont. This means that all their teeth are all equal. They do not differentiate between each other as the human´s teeth or other mammal´s teeth.
Dolphins have different feeding strategies according to the species. They might be suction feeders, or they might catch their prey using the jow and mandible occlusion strenth.
Dolphins that catch their prey by using their jow and mandible do not chew, so they use teeth mostly to catch their prey and manipulate them before swallowing them. This is why they do not need differentiated teeth. Because they just use them to catch and manipulate.
Those dolphin species that are suction feeders do not need teeth to catch their prey because they just suck them. Most of these species only have a few teeth, mostly in their jows. These teeth are used for fighting with other individuals. Inter- and intra-specific fights among animals of the same gender and age are very common. It is believed that as these species do not need teeth for catching their prey, they evolved loosing most of them but those needed during confrontations. This is the case of Grampus griseus, Risso´s Dolphin, that only have 5 to 7 teeth in their jows.
Which of the following best describes how crossing over occurs during meiosis?
Answer:
first give the following options bro..
A purebred tall pea plant is cross-pollinated with a tall, heterozygous pea plant. Use a Punnett square to determine the probability the offspring inherita
recessive short allele. (I point)
75%
25%
0%
50%
Answer:
0%
Explanation:
This question involves a gene coding for height in pea plants. The allele for tallness (T) is dominant over the allele for shortness (t). This means that allele T will be expressed over allele t in an heterozygous state.
A purebred tall plant will possess genotype: TT while a heterozygous tall plant will possess genotype: Tt. The two parents will produce the following gametes:
TT- T and T
Tt- T and t
Using these gametes in a punnet square (see attached image), the following offsprings with genotypes: TT and Tt in a ratio 1:1 will be produced.
TT offsprings are purebreed tall while Tt offsprings are heterozygous tall. Hence, based on the question, no offsprings of this cross will possess the recessive genotype (tt). This means that 0% of the offsprings of this cross will be short.
Which of the following can a chemical bond do?
A. Change element properties
B. Store energy
OC. All of these
D. Release energy
The following can a chemical bond do is all of these. The correct option is C. All of these.
What is a chemical bond?A chemical bond is a bond formed between two elements. The energy of the reaction is stored in the bonds when the reaction happens, the energy is released from the bonds. It also changes the chemical properties of the elements.
Thus, the correct option is C. All of these.
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The amount of matter something has is
Answer:
mass
Explanation:
mass is the amount of matter an object is made up off.
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The amount of matter a substance have is known as Mass. Mass is a fixed everywhere in the universe. Sometimes we get confused between Mass and weight, but we should remember that Weight is the force with which a body is attracted towards earth. And above is the definition of mass. It is measured by common balance.
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A cross-sectional view of a log shows a concentric pattern. Which part of the stem gives rise to this pattern?
A cross-sectional view of a log shows a concentric pattern. Which part of the stem gives rise to this pattern?
B. Xylem
as it contribute for most of a tree's growth in diameter.
Choose a strategy to clone genes known only by a mutant phenotype in organisms with highly efficient transformation procedures and relatively small genomes.
Answer:
By combining traditional genetic mapping with whole-genome sequencing (next-generation sequencing)
Explanation:
Map-based cloning, also named positional cloning, is a technique used to identify genetic sequences linked to markers whose exact physical localization in the genome is known. Map-based cloning has shown to be useful to clone genes, however, this approach is limited to the existence of mutant phenotypes in different organisms/accessions/strains. In recent years, map-based cloning has been combined with next-generation sequencing methodologies in order to clone genes in background of single mutants without information on multiple organisms. This type of strategy has the potential for identifying causal mutations and thus clone genes in species with small genomes and high transformation efficiencies such as, for example, Arabidopsis thaliana.
Which of these statements most accurately describes currencies in North America
Answer:
North American countries have done away with separate currencies. Each country in North America uses its own currency. 2. See ...
As part of your research, you examine mRNA expression for the parents, their two unaffected children, and their affected child with a Northern blot using a full-length cDNA probe.Your results, shown here, are as follows:Both parents have low, but detectable, mRNA expression.The unaffected children have either normal or low mRNA expression.The affected child has no detectable mRNA expression. What possible molecular defect could explain these results?Select every legitimate possibility from the choices below.a. The recessive allele could be a premature stop codon that prevents the translation of a full-length protein.b. The recessive allele could be a mutation in the promoter region that prevents RNA polymerase II from binding.c. The recessive allele could be a mutation in the transcribed region that makes the mRNA unstable and causes it to degrade.d. The recessive allele could be a mutation in regulatory DNA that prevents chromatin from being remodeled from a closed to an open state.e. The recessive allele could be a mutation in a splice donor or acceptor sequence that prevents proper mRNA splicing, leaving an intron in the spliced transcript.
Answer:
b.c d are the answer options
Explanation:
b. The recessive allele could be a mutation in the promoter region that prevents RNA polymerase II from binding.
c. The recessive allele could be a mutation in the transcribed region that makes the mRNA unstable and causes it to degrade.
d. The recessive allele could be a mutation in regulatory DNA that prevents chromatin from being remodeled from a closed to an open state.
in option b, the synthesis of mRNA is going to be halted
in option c, mRNA is undergoing degradation, it will be invisible in the northern blot.
in option d, mRNA in expression of each gene is going to be turned off.
.
please help...??????
Answer:
See below
Explanation:
A. Crust (This is the outermost layer of Earth)
B. Inner Core (Innermost part of Earth)
C. Asthenosphere (The layer below lithosphere)
D. Mesosphere (The middlemost layer)
E. Outer Core (The layer above inner core)
F. Mantle (Consists of further three layers)
G. Lithosphere (The layer below crust)
Answer:
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Explanation:
Crust is the topmost layer.
Inner core is the deepest layer near the core.
Asthenosphere is the layer below the lithosphere.
Mesosphere is the layer that makes up most of the mantle.
Outer core is the second deepest layer above the inner core.
Mantle is the largest layer.
Lithosphere is the layer directly below the crust.
Which of the following is a testable scientific question
Answer: Just took the test: Its "How does the age of city affect the number of trees in the city? "
a mother has heterozygous type a blood and the father has type ab blood. what is the probability of the offspring having type O blood
Answer:
None
Explanation:
This is because A and B are dominant over O. Hence the overshadow the O group in the phenotype.
After the centromeres separate during mitosis, the chromatids, now called _______, move toward opposite poles of the spindle.
Answer:
Daughter chromosomes
Explanation:
Why photosynthesis can't take place in such an environment , where there is no oxygen..? And exactly why trees need oxygen for photosynthesis ?
Answer:
Photosynthesis is a chemical process that leads to the release of oxygen as a by-product and is necessary for cellular respiration
Explanation:
The plants produce or make oxygen form the wastes of starch, sunlight carbon dioxide, and water. In order to burn the sugar that is stored in the plants, it needs to have sunlight which requires oxygen. As the break down of sugar C6 H12 O6 to CO2 and H2O needs O2 to do it. Which is called cellular respiration. This is also stated by the first law of thermodynamics that energy cannot be created and neither destroyed but transforms itself. Photosynthesis is the chemical process that is used to convert this chemical energy which makes carbon and water into glucose and oxygen is released as a by-product.I know it’s sorta not biology but oh well... so my teacher loves rocks and is wanting us to find a rock and name what type it is and so on and I know it is sedimentary but don’t know what type.
Answer:
I guess its sandstone
Hormones perform important functions within the reproductive system. During puberty, secondary sex characteristics develop. Which hormone is responsible for the development of these characteristics in the female?
Answer:
estrogen
Explanation:
it helps in regrowth of endometrial regrowth ovulation and calcium absorption and is also responsible for breast development
Hii!! The correct answer is A. estrogen. (:
In meiosis, each centromere has a spindle fiber attached only to one side. In mitosis, each centromere has a spindle attached to how many sides?
Answer:
In mitosis, each centromere has a spindle attached on both side of centromere
Explanation:
In mitosis, each centromere has a spindle attached on both side of centromere because Spindle fibers move chromosomes during cell division by attaching to chromosome arms and centromeres. A centromere is the specific region of a chromosome where replicates are linked together.
Spindle fibers are active in mitosis and also meiosis and they move throughout the cells and also direct chromosomes to move to where they need to move to.
Spindle fibers function in centromere in mitosis and meiosis by pulling homologous chromosomes apart after they might have been replicated to prepare for division.
Jeremiah is on a school trip to a forest preserve. According to the urban heat island effect, as Jeremiah leaves the city and heads toward the nature preserve, the temperature should (first drop-down) . That's because large cities (second drop-down) more heat than rural areas. When Jeremiah arrives at the preserve, he immediately notices the effects of solar radiation. The blacktop in the parking lot feels (third drop-down) the green grass where his class will eat their picnic lunch. →First drop -down options 1. Remain the same 2. decrease 3. increase Second drop-down options 1. absorb 2. transmit 3. reflect third drop-down options 1. hotter than 2. cooler than 3. same temperature as←
Answer:
2. decrease
3. reflect
1. hotter than
Explanation:
As Jeremiah will move towards nature preserve the temperature will decrease because heat once absorbed as energy is reflected by a temperature rise and large cities reflect more heat than rural areas. It is so because large cities have buildings and other structures that absorb fore heat and reflect more heat.
The blacktop will be hotter than the green grass because blacktop reflects more heat in comparison to green grass.
Hence, the correct answer is:
2. decrease
3. reflect
1. hotter than
Answer:
decrease
reflect
hotter than
Explanation:
Can carbon dioxide or carbon monoxide cause carbon poisoning?
Explanation:
carbon monoxide can cause carbon poisoning.
Which scientific questions can be disproved by conducting tests? Select all that apply. Do video games negatively impact mental health? Will my published scientific paper be successful? Can monkeys communicate with each other? Are dogs the most responsible type of pet? Are vegetables good for growing strong bones?
Answer:
Do video games negatively impact mental health?
Are vegetables good for growing strong bones?
Explanation:
A scientific question is one that can be subjected to experimental verification. Experimentation is then used to obtain valid data which can be used to answer the question.
A good scientific question must contain a dependent and an independent variable. The independent variable is manipulated and its effect on the dependent variable is observed.
In the two options chosen;
Effect of video games on mental health can be observed by conducting a research experiment on people who play video games and those who do not play video games.
Effect of vegetables on strong bones can be studied by conducting a research experiment using people who eat vegetables and those who do not eat vegetables.
When you touch an object that is very hot you quickly pull your hand back.
What is the correct pathway of nerve impulses for this behavior?
Answer:
this is called reflect action
Answer:
reflex action
Explanation:
this is because, it makes it possible to swiftly pull back your hand if you accidentally touch a hot pan
Which of the following correctly describes the order of events occurring during a sympathetic nervous system response?
Answer:
Stimulation of thoracic or lumbar spinal regions; impulse reaches chain ganglion; acetylcholine release
Explanation:
Which organisms transform nitrogen to a form that is useful to plants?
bacteria
animals
fungi
humans
Answer:
Bacteria
Explanation:
Nitrogen fixation is the step of the nitrogen cycle that occurs with the help of microbes. Bacteria transform the nitrogen into a usable form for the plants. Thus, option a is correct.
What are nitrogen-fixing bacteria?The nitrogen cycle is the part of the biogeochemical cycle that converts nitrogen into other forms that can be used by plants. The nitrogen is converted through the nitrogen-fixing bacterias.
The nitrogen-fixing bacterias are heterotrophic in nature that lives freely in the soil. A few examples are Bacillus, Azotobacter, Clostridium, etc. These bacterias transform the atmospheric nitrogen into usable compounds called ammonia which is the fixed nitrogen and can be used by the plants.
Therefore, nitrogen-fixing bacterias transform nitrogen.
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C. If you combined the elements in the product of this reaction, what type of
reaction would it be? Hint: What is the reverse of the equation you just
balanced? (1 point)
Answer:
Reversible reaction
Explanation:
If the elements of the product combine together in a chemical reaction, this reaction is called reversible reaction because the reaction moves in backward or reverse direction. For example, if acid i. e. HCl combine with base i. e. NaOH which are the reactants, it produces two products salt (NaCl) and water (H2O). If salt (NaCl) and water (H2O) combine again with each other, it produces acid i. e. HCl and base i. e. NaOH, such type of reaction is called reversible reaction.
One of the most common causes of acute tubular necrosis (ATN) is:________.
a. ischemic conditions.
b. cytotoxic agents.
c. immune reaction.
d. prolonged postrenal kidney injury.
Answer:
a. ischemic conditions.
Explanation:
Hello,
In this case, considering that acute tubular necrosis (ATN) has been widely acknowledged as a harmful medical condition showing off the death of tubular epithelial cells that give the form to the renal tubules of the kidneys; it presents with acute kidney injury. Thus, common causes of ATN include low blood pressure and use of nephrotoxic drugs which is more technically known as a. ischemic conditions in which the blood flow is very weak.
Regards.
What is an example of nature exhibiting zero
waste?
1. Oxygen is a waste product
from plants.
2. Oxygen is a waste product
from animals
3. Animals consume oxygen in
respiration
4. Plants consume oxygen in
photosynthesis
A
1 and 3
B
1 and 4
С
2 and 3
D
2 and 4
Answer:
idontknow
Explanation:
you are aintelligent nice qiestion
Dr. Payton is a psychiatrist who believes that the source of all
human behavior comes from the unconscious mind. Dr. Payton
likely follows which school of thought in psychologs
Answer:
The Psychoanalytic School of Thought
Explanation:
Psychoanalysis is a school of psychology founded by Sigmund Freud. This school of thought emphasized the influence of the unconscious mind on behaviour. Freud believed that the human mind was composed of three elements: the id, ego and superego.
A purebred tall pea plant is cross-pollinated with a tall, heterozygous pea plant. Use a Punnett square to determine the probability the offspring inherita
recessive short allele. (I point)
75%
25%
0%
50%
Answer:
50%
Explanation:
because if you use the box method you see that half receive a short alele.
T t
T TT Tt
T TT Tt
Is minerals renewable or non renewable?
Answer:
Minerals are non renewable if it is fossil......
Answer: Minerals are nonrenewable resources.
Explanation:
A nonrenewable resource is a resource that can not be replenished during a human lifespan. Minerals, metal ores, and fossil fuels are examples of nonrenewable resources.
the origin of a muscle is generally
explain the question more
Answer: The stable and proximal attachment
Explanation:
