This morning in class, oya learned about the way neighboring neurons are involved in the firing of an individual neuron. if enough neighboring neurons signal to the receiving neuron to pass along the message, their combined signal becomes excitatory and the neuron will:

If enough neighboring neurons signal to the receiving neuron to pass along the message, their combined signal becomes excitatory and the neuron will fire.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

c is the answer to this question. altitude affects the weather because air molecules evaporate.