Your circulatory system consists of your heart, blood vessels and blood, and is responsible for transporting life-giving oxygen throughout your body. When you exercise, your body's need for oxygen increases; the harder you work out, the more oxygen your body demands.
Answer:
A.
Explanation:
in DNA, G matches with C and A matches with T. G cannot match with G, A cannot match with A, etc.
D.uracil is the nitrogen base bind with adenine
Answer:
a lizards chance of hiding from other predators if twitching decrees if not twitching increes
Explanation:
