Question

read the passage. called nares, a sharks nostrils sit on either side of its snout. as water passes through them, the nares special nerve endings detect scents. this information is relayed to the sharks brain, which then interprets it. this olfactory, or smelling, system gives the shark its keen ability to detect odors underwater. this is especially valuable for a marine hunter. sharks nares are so acute that they allow sharks to perceive smells up to a quarter of a mile away. nares also help sharks track their targets. if the smell of a fish enters the sharks right nostril, the shark knows to swim in that direction. when combined with other remarkable senses—including an ability to detect electrical fields and subtle changes in pressure—the sharks olfactory system makes it an especially effective predator. what is the main, or central, idea of the passage? the underwater environment puts predators of the ocean at an unfair disadvantage. the sharks acute olfactory sense helps it identify prey and determine its location. sharks possess an excellent sense of smell, but theyre held back by other weaker senses. sharks owe their hunting skills to their exceptional ability to utilize their five senses.

Explanation:

The passage focuses on how a shark's olfactory system, with its acute sense of smell, helps it detect odors underwater, track prey, and be an effective predator. It emphasizes the role of the olfactory sense in identifying prey and determining its location.

Answer:

The shark's acute olfactory sense helps it identify prey and determine its location.