Which definition is Migration? A. animal is protected by resemblance to an unpleasant animal
B. movement of animals to find food, reproduce in better conditions, or find a less severe climate.

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.

The polio virus can cause skeletal muscle paralysis by destroying neuron cell bodies. what area of the spinal cord is destroyed

Some of the money that people deposit into a bank eventually becomes a interjection into the economy when the bank