What biochemical mechanisms reflect the unity and difference of organisms?

Good uniformity. Example:

All organisms with cellular structure need to synthesize protein, while protein's raw materials are 20 kinds of amino acids. This reflects the unity of biology.

The difference is not difficult:

Most plants convert sugar into carbon dioxide and ethanol through anaerobic respiration, while animals convert sugar into lactic acid through anaerobic respiration. This reflects the biological differences.

I hope it helps you.

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