Answer:
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
genetic modification
. Because the fish are now able to swim in deep water, their
predators
in shallower water will have less food. Likewise, competition for food among deep-water fish that eat the same types of food will
decrease
.