20) What do you mean by the term 'ecosystem'? Explain with an example? 21) Describe any one effect of endogenic forces.

22) Illustrate how wind is caused with the help of a labelled diagram

An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Abiotic factors include rocks, temperature, and humidity.

Explanation:

example:

dessert

forest

grassland

rainforest

tundra

coral reef

aquatic ecosystem

savanna

taiga

the number of senators, and representatives, the state has in congress.

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modern american cars are not available due to trade restrictions