The sequence of amino acids in a protein is determined by DNA. In a protein that is present in all species, the amino acid sequence will be different. Once a protein has been chosen, the amino acid sequence of that protein in different species are compared. More similarities, or fewer differences, indicate that two species are closely related. (sorry if im wrong!)
Answer:
The functional units of dna that contain the instructions for making one or more proteins are the "Genes".
This would be a behavioral adaptation because it is a trait they learned to do over time.
The rapid release of air/ gas bubbles during cooling
Mitochondria produce d. ATP and sugars
Hope that helps!