What controls the rate at which materials (like food) get into a cell

!if we removed the wolf, snake, and hawk from this food web, what best explains the impact it would have? a) the number of producers would increase. b)the number of decomposers would increase. c)the number of primary consumers would increase. d)the numbers of primary consumers would decrease.

Which of the following explains why a tree is often used as a model to represent the principle of common descent

Which particle controls what element an atom is?