The best and most correct answer among the choices provided by the question is <span>evolution.
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Evolution is about 65% cause of the natural selection.<span>
Hope my answer would be a great help for you.</span>
Answer:
The Agouti gene controls the distribution of black pigment. The dominant allele A restricts black pigment to the points of the horse (mane, tail, lower legs and ear rims), as seen, for example, in bays and buckskins.
<span>Molecular clock is a scale which uses a technique whereby evolutionary time for different life forms is deduced from the mutation rate of biomolecules. Biomolecular data used for calculations in order to come up with the prehistoric time scale normally uses nucleotide sequences for DNA or amino acid sequences for proteins.
Hence, in order to develop a molecular clock, one would need: a sequence of molecules, the rate at which changes occur in a type of molecule and how much total change has occurred in a type of molecule from different species.</span>
3. is oxygen the others i would have to double check my book, so give me a minute and I'll try to put the rest in the comments
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