Explanation:

- The passage highlights the vital role of elephants in ecosystems, particularly in seed dispersal.

- 1. The term "seed dispersers" describes how elephants help spread seeds, enabling plant growth.

- 2. "Forests without elephants" signifies the lack of these creatures affects plant dispersal.

- 3. "Young saplings" refers to the new plants or trees that emerge through seed dispersal facilitated by elephants.

- 4. "Certain species" indicates specific plants rely on elephants to spread their seeds.

- The correct choice for 5. would be a term suggesting how elephants adjust to changing environments.

- Explaining: Not suitable, as it doesn’t relate to adjustment capabilities.

- Adapting: Correct, as it captures the elephants' ability to adjust.

- Expanding: Implies growth, not necessarily linked to adaptability.

- Structuring: Refers to organization, not adaptation.