Deforestation. The animals forest that they once lived in are bein cut down.
        
             
        
        
        
Answer:
the sampling method because it involves continuing the total of numbers or organism.
 
        
             
        
        
        
A,B,C and D
A. increase in the number of available neurotransmitters 
B. decrease in the number of available neurotransmitters 
C. increase in the number of receptors and receptor sites 
D. the ability of the synapse to change in strength and function when the pathway is overused or underused
 
        
             
        
        
        
The answer is D. Chromosomes contain genes, and genes are made of DNA