Answers

2016-04-25T17:18:16+05:30
All plants give oxygen and take in carbon- dioxide. plants give us food to eat. plants make the environment beautiful. some plants have very good scent. plants give us. plants such as bamboo give material for building various things. 
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2016-04-25T17:19:10+05:30
Bcoz  they inhale co2 and reales o2 so by obserbing co2 heat is decreased in environmet 
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