If 2 different people use the same dichotomous key on the same organism it’s only natural for them to have the same results. It wouldn’t make sense if they had different results unless one of them made an error.
I think that this would be carbohydrates, I'm not completely sure though.
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Because since their ancestors came before them then they inherit certain beneficial traits that help them survive. Those traits are in the DNA and the animals are evolving to be more fit for the environment that they are in. (hope this helps)
