Which of the following is Natural Selection? A) Organisms develop traits that allow them to survive and reproduce
B) Inherited traits change over time
C) Traits that offer and advantage / benefit will be passed on to offspring
D) All are correct

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 model illustrates a process by which a substance is taken up by a cell

Which element provides strength to the exoskeleton of clams and oysters