Awildlife biologist suggests re-introducing the eastern cougar into southern alabama, reasoning that besides bears, which can survive off of berries and grubs, there are no large natural predators, and that it would be good for the food chain. it is assumed that the eastern cougar would eat deer, which in turn, graze on tree bark, shrubs, and leaves. the average cougar weighs about 100 pounds, as does the average deer. the average cougar has a range of one square mile. a recent biological study showed that there were about 16 deer per square mile in alabama, an average about 40,000 pounds of vegetation per square mile, and an average of 9.5 people per square mile in southern alabama. despite the biologist's proposal, other biologists vote against re-introducing the cougar. which of these is a possible valid reason for this?

Hunting in the darksome fish rely on senses beyond sight. in the darkness of the marianas trench, a fish called the rattail has an extremely sensitive sense of smell. the fish uses scent, rather than sight, to steer toward food. once it's near food, the rattail uses a special organ on the bottom of its chin to guide itself by feel.marine snowone staple of the deep sea diet is "marine snow," flakes of organic, edible substances that sink down from the upper ocean. animals at the ocean's bottom find sustenance in everything from the bodies of dead creatures to fecal matter. marine snow is diverse enough to support numerous species. for instance, several species of snails and worms feed exclusively on deceased whales.microorganismsthe deep sea is an intricate ecosystem, and even the ocean floor itself plays a part. hydrothermal vents are cracks in the sea floor where erupting magma mixes with ocean water to produce plumes of hot, sulfur-rich chemicals. some microbes can use these chemicals for energy, sustaining their existence and that of the animals who depend on their roles in the deep sea food chain.