Question

review the details below.

• tundra swan parents lead their young to feeding sites in the water, where the adults bring up submerged food.
• if adult tundra swans are threatened by predators—especially humans, bears, or wolves—they may leave their nests to draw attention away from their young.
• tundra swans breed on the arctic tundra in north america and must protect their chicks from the cold by building nests made of grasses and moss.

choose the best topic sentence to introduce a paragraph containing these details.
adult tundra swans use several strategies to protect and nurture their young in the arctic.
the arctic tundras unique environment makes it a challenging place to raise offspring.
tundra swan parents keep their chicks warm and help them search for food.

Explanation:

The details focus on how adult tundra swans protect and nurture their young in the Arctic, such as leading to feeding - sites, drawing predators away, and nest - building. The first option encompasses all these aspects. The second option is too general about the Arctic tundra environment without emphasizing the swans' behaviors. The third option only mentions warmth and food - search, missing the predator - distraction aspect.

Answer:

Adult tundra swans use several strategies to protect and nurture their young in the Arctic.