Nitrogen in the atmosphere must be "fixed" before it can be used by plants. atmospheric nitrogen is "fixed" by a) plants. b) bacteria. c) bacteria and insects. d) bacteria and lightning.

Look at the punnett square for an x-linked recessive disease. is it possible for a female offspring to have the disease?

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 is a genetic engineering advancement directly related to a career in biotechnology? 1) improving solar energy collection 2) transporting textiles at higher rates 3)creating crop foods that resist insect pests 4)repairing historical sites with quality materials