PLEASE HELP ME WITH 3 NO FAKE ANSWERS I WILL MARK BRAINLIEST

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

!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.

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important