Answer:
The endosymbiotic theory describes how a large host cell and ingested bacteria could easily become dependent on one another for survival
Explanation:
They form lactic acid which needs to be broken down as it is dangerous to the cel
Only a fraction of the genes in a cell are expressed at any one time. The variety of gene expression profiles characteristic of different cell types arise because these cells have distinct sets of transcription regulators
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Answer:
<h2>Letter A</h2>
Explanation:
Respiration means to breathe and we breath oxygen and without it we will die.
