What scienctific terms are used for the living and nonliving things in an envoriment

Ecosystem=

The living and nonliving things in an environment and all their interactions

A subcontinent is a large distinguishable part of a continent, that is connected the the remaining part of the continent on one side (so surrounded by 3 sides of water) : most typically.

One of the subcontinents is sometimes referred to as "The" Subcontinent" The Indian subcontinent; I think it's likely this is the answer to your question.