You are doing biology field work studying two species of lizards on a small volcanic island. although quite hostile to each other when they accidentally meet, the two species usually remain in separate parts of the island. species a seems to live and hunt insects only in the lower grassland part of the island. species b seems to live and hunt only in the upper rocky areas. species a has a short tongue but has longer legs and is a faster runner. species b is short, squat, runs slower, but has a long tongue. you observe species a chasing down some pretty large, fast- moving insects, while species b meanders from rock to rock, using its long tongue to get insects hiding between rocks and in cracks. what principle of ecology do your two lizard species demonstrate?