In the image, balls that look alike represent the same type of atom. based on this information, what do the images below represent?
a
molecules of compounds
b. molecules of elements
c
molecules of mixtures
d. molecules of water

The gene that causes sickle-cell disease is present in a higher percentage of residents of sub-saharan africa than among those of african descent living in the united states. even though this gene causes sickle-cell disease, it also provides some protection from malaria, a serious disease that is widespread in sub-saharan africa but absent in the united states. discuss an evolutionary process that could account for the different percentages of the sickle-cell gene among residents of the two regions.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

The first generation of offspring from the cross of two parents is called the a. f1 generation b. f2 generation c. short generation d. p generation