A : DNA in the nucleus of the egg controls all cell activities
The andswer to the question is Endocrinology!
<span>Organic Chemistry is so important in the study of Biology because most reactions in Biology are organic reactions. Organic chemistry is the study of structure, properties, and reactions of organic compounds</span>
The number of fossils found, the fact that fossils are oftentimes just a cast/mold of the organism with no real remains, and no interbreeding.
As time moves forward, we still strive towards better methods to answer questions about extinct organisms.