A functional unit of nature where living organisms interact among themselves AND with the surrounding physical environment.

What is the largest ecosystem of all?

The entire BIOSPHERE — regarded by many ecologists as a global ecosystem, a composite of all local ecosystems on Earth.

Name the two basic categories of ecosystems, with NCERT's examples.

TERRESTRIAL — forest, grassland, desert. AQUATIC — pond, lake, wetland, river, estuary.

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