Answer:
The correct answer is option A. "the temporary hyperpolarization of the axon membrane following the action potential spike".
Explanation:
Action potentials, also known as "spikes" or "impulses", are electric impulses that neurons use to send information from the cell's body down to the axon. The impulses are created when ions travel across the neuron's membrane creating a depolarization current. This depolarization current is responsible for an temporary hyperpolarization of the axon membrane following the action potential spike. When neurons are hyperpolarized they are not able to produce another action potential. In consequence, actions potentials move in one direction along the neuron away from the cell body, as well as, adjacent locations go trough similar depolarization processes. 
 
        
                    
             
        
        
        
Answer:
An ecologist must consider both of the speciation and extinction of an organism or when analyzing the diversity the life on earth because of the following reasons;
-          It is a role of an ecologist
-          It is part of their job
-          This will tell the existence of the organism
-          The organism’s life span on earth
-          How it was existed and were extinct
Explanation:
 
        
             
        
        
        
The reason why Koala bears are restricted to live in a
certain habitat is because they can only eat a certain type of eucalyptus leaf.
These bears are indigenous to Australia. They are nocturnal and live in tropical
where temperate eucalyptus forest can be found.