Question

review the details below.

• lions feed on large herbivores like zebras and giraffes.
• elephants graze on grasses and break down plants, making the vegetation edible for smaller herbivores.
• vultures eat meat left over by large predators.

choose the best topic sentence to introduce a paragraph containing these details.
the african savanna is home to scavengers, which survive off the remnants left by predators.
animals in the african savanna depend on other animals in their ecosystem to survive.
the warm climate of the african savanna makes food plentiful for all animals.

Explanation:

The details show a web of dependencies. Lions (predators) rely on herbivores. Elephants' actions help smaller herbivores. Vultures (scavengers) rely on predators' leftovers. So the topic sentence should highlight mutual - dependence.
The first option only focuses on scavengers. The third option talks about climate, which is not in the details. The second option “Animals in the African savanna depend on other animals in their ecosystem to survive” encompasses all the relationships (predator - prey, one animal facilitating food for others, scavenger - predator leftovers) shown in the details.

Answer:

Animals in the African savanna depend on other animals in their ecosystem to survive.