Question

5 what is the main idea of the text?a sea turtles spend the first years of their life drifting along with ocean currents before finding their feeding grounds and nesting sites.b sea turtles migrate long distances to survive, and their habitats must be protected from human threats to maintain balanced ecosystems.c sea turtles often lose access to their nesting sites because of human development and pollution, which are quite damaging.d sea turtles have a built-in gps that uses the earth’s magnetic field and their memory of ocean currents and coastlines to help them migrate.

Explanation:

To determine the main idea, we analyze each option:

• Option A focuses only on the early life drifting of sea turtles, which is a detail, not the main idea.
• Option B covers two key aspects: sea turtles' long - distance migration for survival and the need to protect their habitats from human threats to maintain ecosystems. This is a more comprehensive main idea as it includes both the migration behavior and the conservation aspect related to ecosystems.
• Option C only focuses on the loss of nesting sites due to human development and pollution, which is a specific problem, not the overall main idea.
• Option D focuses on the navigation mechanism of sea turtles during migration, which is a detail about how they migrate, not the main idea.

Answer:

B. Sea turtles migrate long distances to survive, and their habitats must be protected from human threats to maintain balanced ecosystems.