What is an ecosystem? Give two examples of natural ecosystems.

An ecosystem is a community of living organisms (plants, animals, and microorganisms) interacting with each other and with their non-living environment (air, water, soil, sunlight). Every part of an ecosystem depends on the others, creating a balance.

Example 1: A forest ecosystem, where trees, animals, soil, and streams interact.

Example 2: A pond ecosystem, where fish, algae, water, and microorganisms live together.

Thus, ecosystems show how life and environment are connected.