Fill in the blanks:
1. _____ are called as biotic factors.
2. _____ is the best example of natural terrestrial ecosystem.
3. Ecosystem originated without human intervention is called _____
4. The ecosystem in water is called _____ ecosystem.
5. ____ obtained energy from the chemical breakdown of dead organisms.
6. The sequence of who eats whom in an ecosystem is called as ____
7. The food chain begins with the energy given by the ____
8. Each level in the food chain is called a ____ level.
9. The burning of solid waste in ____ is called incineration.
10. Garbage buried inside landfills remain here for a long time as they decompose very slowly and become ____
11. Polluted _____ affects skin, eyes and respiratory system.
12. Land (Soil) pollution happens when toxic change the natural balance in soil
