Answer:
Predators, food chain, fights with males, toxic water, contamination, plastic
Explanation:
 
        
             
        
        
        
Composting, recycling, preventing waste.
 
        
             
        
        
        
Answer:
Outer, middle and inner layer. 
Explanation:
Major Ocular Structures
The eye is made up of three layers: the outer layer called the fibrous tunic, which consists of the sclera and the cornea; the middle layer responsible for nourishment, called the vascular tunic, which consists of the iris, the choroid, and the ciliary body; and the inner layer of photoreceptors and neurons called the nervous tunic, which consists of the retina.
 
        
                    
             
        
        
        
nucleotides, and the polymer i think ......
 
        
             
        
        
        
Kin selection, I think this is right, but I am not sure