A species of fish evolved over thousands of years to have gills that allowed the fish to swim deep in the sea. What’s the effect of this development on deep-water resources? The fish developed the gills because of . Because the fish are now able to swim in deep water, their in shallower water will have less food. Likewise, competition for food among deep-water fish that eat the same types of food will .

1.

A. genetic modification

B. hybridization

C. natural selection

2.

A . competitors

B. predators

c. prey

3

a .increase

b. decrease

C. not change