Aspecies 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 . 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

Can you identify which of the following groups of organisms are, or are not, populations? a. the american bison (bison bison) and grey wolves (canis lupus) currently living in yellowstone national parkb. all of the rainbow trout (oncorhynchus mykiss that) that have ever lived in lake eriec. the group of american bison (bison bison) currently living in yellowstone national parkd. a group of calliope hummingbirds (selasphorus calliope) and a group of rufous hummingbirds (selasphorus rufus) living in the same new hampshire woodse. the northern cardinals (cardinalis cardinalis) living on opposite shores of lake champlain f. all of the whales currently living in the atlantic ocean off cape cod, massachusetts