Human brains cells have- 1. contain only the parts of dna that are needed
2. the same dna molecules as the other cells but some parts of the dna are turned on and other parts off.
3. half the dna molecules as liver cells and use different parts of the dna to preform different specialized functions
4. a different number of dna molecules as other 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

Which feature of a human community is similar to a niche in a biological community

You want to cultivate some exotic plants at your farm. however, the climate is chillier than the temperature range favorable to the crop. which is the best method to use for the cultivation of this exotic crop? a. use a crop rotation method b. use a lot of fertilizer c. prepare the seed bed properly d. use a greenhouse e. use irrigation