Question

4. All animals and plants need oxygen for excretion. (True/False)
5. Oxygen constitutes about
of the air.
6. The level of
in the atmosphere also play a role in determining the global temperature.
7. Water vapour are formed due to melting and boiling of water. (True/False)
8. Dust particles are only sometimes present in the atmosphere. (True/False)​

Answer 1

Answer:

4)T

5)T.

6)T

7)T

8)F

.......

Explanation:

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Answer 2

4, True

5, 71 percent

6, True

7, False

8, False