Answer: sympathetic nervous system prepares body for intense physical activity and known as flight or fight response whereas parasympathetic nervous system is almost the opposite, it relaxes the body and slows many human functions
Explanation:
 
        
             
        
        
        
OK like most things chlorophyll is found in the chloroplasts of green algae
        
                    
             
        
        
        
Answer:
silicon and carbon have tge same number of valence electrons !
 
        
             
        
        
        
Answer:
Directional selection
Explanation:
Directional selection is a type of natural selection that favors one extreme phenotype of a genetic trait due to its survival and reproductive advantage to the individuals over another extreme phenotype and the intermediate phenotype. 
In the given example, the thick-leaved plants are better adapted to a drier climate due to reduced water loss. Directional selection favored the plants with thick leaves which in turn produced more progeny. Over the generations, the population evolved into the one having more number of thick-leaved plants. 
 
        
             
        
        
        
It is basically A burning forest like the one in California