Answer:
Make up the skull and composed of the brain 
Explanation:
 
        
             
        
        
        
If the stimulus reaches the threshold an action potential will be generated. If the stimulus doesn't reach it no action potential will be generated. If the stimulus will be stronger the action potential will have the same amplitude. The refractory period makes it harder to generate an action potential so they decrease the frequency of action potential production.
 
        
             
        
        
        
As temperatures increase, zooplankton reproductive rates will increase, reducing the delay between phyto- and zooplankton blooms. If phytoplankton become more tightly “coupled” to zooplankton, inputs to the benthos may be altered, modifying energy flow within estuarine and coastal food webs.
        
             
        
        
        
Question 1 ) muscle cell maintains homeostasis is not an example of the <span>intracellular communication.
Question 2 ) </span>intracellular receptor goes into action <span>When non-nerve cells become involved in response to signals.</span>