How is cellular respiration an example of a biochemical process, or a chemical reaction that occurs in living organisms?

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What would be the result if crossing over did not happen during meiosis in humans? a. there would be less genetic variation in humans. b. parents would be more likely to look like their children. c. the human population could not reproduce. d. children would have more chromosomes.

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur