Q2 of 25 Page 293

What is an environment?

Environment is a system where all organisms, like plants, animals and human beings, interact with their physical surroundings.


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1

How many molecules of ozone can be decomposed by one atom of chlorine?

 1

The most important compound which accounts for almost 80% for the total depletion of ozone layer is:

 2

Define ecosystem.

 2

Define food chain and food web.