Chargaffs rules states that dna from any cell of all organisms should <span>have a 1:1 ratio (base Pair </span>Rule<span>) of pyrimidine and purine bases and, more specifically, that the amount of guanine is equal to cytosine and the amount of adenine is equal to thymine.</span>
Answer:
A dichotomous key is a tool that allows the user to determine the identity of items in the natural world, such as trees, wildflowers, mammals, reptiles, rocks, and fish. Keys consist of a series of choices that lead the user to the correct name of a given item. "Dichotomous" means "divided into two parts".
Explanation:
I'm pretty sire the answer to this would be
c. <span>add new genes to the gene pool </span>
Regardless of the tools they use, scientists conduct modern ecological research using three basic approaches:
• observing
• experimenting
• modeling
All of these approaches rely on the application of scientific methods to guide ecological inquiry.
