Which of the following choices could cause brain damage in an infant? a. lack of affection

b. poor nutrition

c. shaking

d. All of the choices are correct.

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.

case study case study case study case study case study case study case study case study case study case study case study

How does natural selection change thephenotypes within a population over time?