Which component is missing from the cellular respiration? + Oxygen -> Carbon Dioxide + Water + Energy

(A) Sunlight
(B) Sugar
(C) Oxygen
(D) Carbon

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.

Which best describes a rhinovirus? o a. a virus that causes a common cold o b. a protective shell around a virus o c. a tube the comes off a virus o d. a piece of dna transferred by a virus

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.