The presence of the 60 percent of similar genes in the fruit flies and humans, and 97.5 % similar genes in humans and mice suggests that the common ancestory of the humans and mice is much more recent than the common ancestory of humans and fruit flies. The majority of the similar genes in the mice and humans is the indication that they have evolved from a common ancestor not very long ago. However, only 60% similarity between fruit flies and humans indicates that it had been some time since they both have had a common ancestor.
Hence, the correct answer is 'Option D'.
Summary. Base pairs<span> occur when </span>nitrogenous bases<span>make hydrogen bonds with each other. Each </span>base<span> has a specific partner: guanine with </span>cytosine<span>, </span>adenine<span> with thymine (in </span>DNA<span>) or </span>adenine<span> with uracil (in RNA). The hydrogen bonds are weak, allowing </span>DNA<span> to 'unzip'.</span>
Answer:
A
Explanation:
only one type of atom= (PURE SUBSTANCE not mixture)
is atom chemically bonded to another atom? (NO- element, not compound)
Google images, I'm guessing.
