Across
- 2. The ultimate source of energy
- 4. An example of human made ecosystem.
- 5. when we breathe in air, it is called as____
- 7. The last link in food chain
Down
- 1. A gas which is responsible for causing acid rain
- 3. The chemical-free farming and it is one of the best way to maintain soil fertility.
- 6. when a number of food chains are interlinked to each other, it results in ____