Availability of oxygen is an essential ………. of animal life, while carbon dioxide is equally ……… for plant life. 1) choice, optional 2) duplication, selective 3) conversion, exchangeable 4) condition, necessary
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I think 4 option should have to be fit in these blanks
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The correct answer is option 4- condition, necessary.
Description: animals need oxygen to breathe. Oxygen is a condition for them to survive, without oxygen survival is not possible. On the other hand, for plants carbon dioxide is necessary because they need it for the preparation of food during photosynthesis. They need it to convert chlorophyll into glucose and oxygen, in the presence of sunlight carbon dioxide and water.
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