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fix science definition
- To convert inorganic carbon or nitrogen into stable, organic compounds that can be assimilated into organisms. Photosynthetic organisms such as green plants fix carbon in carbohydrates as food; certain bacteria fix nitrogen as ammonia that can be absorbed directly or through nitrification by plant roots. See more at carbon fixation, nitrogen fixation.
- To convert a substance, especially a gas, into solid or liquid form by chemical reactions.
- To kill and preserve a tissue specimen rapidly to retain as nearly as possible the characteristics it had in the living body.
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