Question

Fill in the blanks with appropriate verbs :- 1.Trees support man's life _____ supplying the atmosphere with oxygen.
2.The oxygen in the air is constantly ______ used up and turned into CO2 when animals breath and things burn.
3.The green leaves of trees
and plants _____ this carbon-di-oxide.
4. Carbon-dioxide is the food that plants ______.


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Answer 1

1.Trees support man's life by supplying the atmosphere with oxygen.

2.The oxygen in the air is constantly ______ used up and turned into CO2 when animals breath and things burn.

3.The green leaves of trees

and plants need this carbon-di-oxide.

4. Carbon-dioxide is the food that plants need.

Answer 2

Answer:

the oxygen in the air is constantly