Answer: Gene flow is the movement of alleles from one population to another as a result of the migration of individuals. This causes a reduction in the differences between populations. ... Genetic drift is a change in allele frequencies due to change of events in a small breeding population.
        
             
        
        
        
Answer:
volcanic eruption and solar variation 
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Bile from the gallbladder is escaping through cardiac sphincter into esophagus
        
                    
             
        
        
        
Answer:
if the lungworms and bit flies kill the deer, there won't be food for the coyotes and if the deer do live long enough, the worms and flies might spread to the coyotes. the deer population will decrease along with the coyotes