FALSE
All organisms use this "mechanism" to defend their food and shelter. Birds protect their nest just like all other animals and they fight for food. 
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One gets together with another and it happens then a child comes
        
                    
             
        
        
        
<span>Spermatozoa are the mature male gametes in many sexually reproducing organisms. Thus, spermatogenesis is the male version of gametogenesis, of which the female equivalent is oogenesis. In mammals it occurs in the seminiferous tubules of the male testes in a stepwise fashion.</span>
        
             
        
        
        
Answer:
electron 
Explanation:
elections circle the nucleus 
 
        
             
        
        
        
Answer:
1. filtration , reabsorption , secretion .
2.kidney , ureters , bladder , urethra , pinusia
3.artificial kidney
Explanation: