Answer:
DNA and proteins
Explanation:
By comparing these specific molecules in two different species, scientists can determine how closely related the species are.
Plasma cells are designed to churn out Antibodies. These are proteins that have a variable region which is complementary ( perfect shape fit) for the virus' antigen and can therefore bind to the antigen, making the virus harmless or tagging it to be consumed by a phagocyte.
A hydrogen bond connects the nitrogenous bases of the nucleotides together!
I believe the answer is three
They are called compounds