Question

animal and plant utilise one of the following non-metallic elements directly for --
1). Helium
2). Carbon
3). oxygen
4). Nitrogen
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Answer 1

Answer:

3). Oxygen

Explanation:

Oxygen is a colourless, odourless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere.