Ecosystems — BIOLOGY STD 12 Science — Question

For question 1-4, use this key:Key-

1. Ecology.
2. Population.
3. Community.
4. Ecosystem.

1. A community plus its physical environment.
2. Study of the interactions of organisms with each other and with the physical environment.
3. All populations that are found in a particular area.
4. All members of the same species that inhabit a particular area.