Question

how does a decrease in biodiversity impact an ecosystem?

Explanation:

A decrease in biodiversity reduces an ecosystem's resilience. Fewer species mean less redundancy in roles (e.g., pollination, nutrient cycling). It also weakens the food web, making the ecosystem more vulnerable to disturbances like diseases or climate change. Additionally, it can lead to a loss of ecosystem services such as clean air and water purification.

Answer:

A decrease in biodiversity makes an ecosystem less stable and resilient. It reduces the variety of species performing key functions (e.g., pollination, nutrient cycling), weakens food webs (making it more vulnerable to disturbances like diseases or climate - related changes), and can lead to a loss of essential ecosystem services (such as clean air and water purification).