2. Which of the following is an example of commensalism? a. A tapeworm living in the gut of its host
b. A clownfish living among the tentacles of a sea anemone
C. An acacia tree and acacia ants
d. Bees feeding on nectar from a flower​

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.

Why do carbohydrate molecules function so well as fuel for the body?

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?