What is a clade?

a. a group of organisms with a shared ancestor

b. a trait that an ancestor did not have

c. a group with no shared traits

d. a trait that was passed along

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.

How many types of rock can form from the rock cycle

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell