Answer:
600
Explanation: there is always a 3:1 ratio when you have a dominant and recessive trait.
hope it helps! 
 
        
                    
             
        
        
        
Answer:
As the generations are increasing or gets much over time, we have a more likelihood of seeing a response to natural selections as the favourable alleles are going to be moved from one generation to the next while those that are not favourable would be eliminated over generations.
If the new host gives allowance for early reproduction and ease of access then the generations each year would rise.
 
        
             
        
        
        
Biotic would mean living so fish and sea plants
        
                    
             
        
        
        
Answer:
There you go! they explained it better than I could. hopefully that helps you, for more information you could simply look up an article.