1. Which of Hubble's findings supported the big bang theory? Circle all that apply. (3) a. Galaxies that are closest to ours are moving more quickly than those located farther away. b. Galaxies tend to move toward each other. c. There are billions of galaxies in the universe, not just one. d. The universe formed from a central point. e. Most galaxies in the universe are moving away from Earth.

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. the chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b. the chlorine from the chlorofluorocarbons reacts with free molecules of oxygen causing a stop in ozone production c. free oxygen atoms can replace the chlorine in chlorine monoxide, releasing a free atom of chlorine which can then recombine with an oxygen atom in ozone, destroying more ozone. d. chlorofluorocarbons absorb ultraviolet radiation, preventing the formation of ozone select the best answer from the choices provided

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.

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.