Answer:
Estrous cycles give females repeated opportunities to become pregnant throughout their productive lifetime. The cycle is regulated by the hypothalamic-pituitary-gonadal axis, which produces hormones that dictate reproductive events.
Explanation:
 
        
             
        
        
        
Answer:
No. Instead they contain enzymes. 
 
        
                    
             
        
        
        
an agent, such as radiation or a chemical substance, which causes genetic mutation.
 
        
                    
             
        
        
        
Answer:
A, D
Explanation:
Producers are organisms that get their energy from inorganic matter
Tall grass is a plant that gets it's energy from the sun 
 
        
                    
             
        
        
        
How about "recombinant DNA?" Which is the result of DNA cloning as ttom suggests.