In the American Midwest, native seed crops goosefoot, sumpweed, and sunflowers were farmed about yBP.

Which class of organic compounds makes up the channels and pumps that move materials from one side of the cell membrane to the other? a.) carbohydrates b.) lipids c.) proteins d.) nucleic acids

20 the compound al(nh3)2 has atoms of nitrogen.

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?