A key component in the formation of organic compounds, such as nucleic acids and
ATP

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Phosphorus A key component in the formation of organic compounds, such as nucleic acids & ATP. Nitrogen Most abundant gas in the atmosphere; plants absorb it from bacteria in the soil.

Explanation:

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

a compound light microscope is used to magnify objects in steps.  

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