Question

review the details below.
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.
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 swan parents lead their young to feeding sites in the water, where the adults bring up submerged food.
choose the best topic sentence to introduce a paragraph containing these details.
the arctic tundras unique environment makes it a challenging place to raise offspring.
adult tundra swans use several strategies to protect and nurture their young in the arctic.
tundra swan parents keep their chicks warm and help them search for food.

Explanation:

El primer enfoque se centra en el entorno del Ártico, no en las aves. El tercer enfoque solo aborda dos detalles (calor y comida), mientras que el segundo aborda múltiples estrategias (nidos, distraer a depredadores, alimentación), lo que cubre mejor todos los detalles dados.

Answer:

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