7. Which of the following is a biodegradable substance
a. DDT
b. Teflon
c. Left over food
d. Aluminium
8.an exhaustible natural resources is
a. water
b.air
c. sunlight
d.coal
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Answer:
7. c.Left over food
8. d.coal
Answered by
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(c) Left over food
(d) coal
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