Atoms and Elements: Tutorial 10 of 35
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Part C
The circles, or orbits, for electrons are called energy levels. Each level can hold only a certain number of electrons. Add
electrons to each level until you can't add any more. How many electrons can each level hold?
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All living organisms are composed of a. only one cell. b. at least 100 cells. c. at least three cells. d. one or more 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

What statements describe a host organism?