Which are gametes?
O
O
O
O
A. Estrogen and progesterone
B. Vas deferens and testes
c. Uterus and epididymis
D. Sperm and eggs

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

What is a codon and where is it found

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?