What structure serves as a passageway for both air and food? a. pharynx b. trachea c. larynx d. bronchus

The answer is A. pharynx. The pharynx is a cavity behind the nose and mouth which serves as a passageway for both air and food. The passage for air begins at the nose and nasal cavity while the passage for food begins at the mouth and mouth cavity. These two passages cross at the pharynx but separate soon after. Air passes through the larynx and later into the trachea and bronchus on its way to the lungs. Food passes through the esophagus on its way to the stomach.

Where are the phrases

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.