2. The four nucleotides form hydrogen bonds with each other. a. What are the two bonding pairs?
b. Knowing what we know about antigens/antibodies and enzymes
do
you think these are the bonding pairs?

genetic variation will increase because of a new habitat and food source.

explanation:

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time