What structures do human epithelial cells have in common with elodea cells

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

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

The activity of the modern sample is 1.10 bq . how long does that measurement take?