After several miles of running and sprinting in intervals, the runner’s muscles ache and feel fatigued. which is the best explanation for what has occurred?
the runner's muscles have accumulated lactic acid.
the runner’s body has failed to perform cellular respiration.
the runner’s cells are relying completely on aerobic respiration.
the runner’s muscles have accumulated carbon dioxide.

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Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

As a small change in a person's dna can cause a genetic disorder