Which example is the best description of an adaptation? a heritable characteristic that evolves

a heritable characteristic that helps an organism find food

a heritable characteristic that helps an organism survive and reproduce

a heritable characteristic that helps an organism avoid predators

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.

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

How many types of rock can form from the rock cycle