What type of defense is exhibited by the skunk? A: mechanical B: physical C: chemcial D: behavioral

What is the location when the neuron's electrical signal changes to a chemcial signal? A: axon B: synapse C: myelin sheath D: nucleus

Enzymes speed up chemcial reactions by... A: lowering activation energy. B: increasing the activation energy needed. C: breaking the chemical energy needed. D: stopping the chemical reaction.