Four friends were talking about the food they ate. Here is what they were discussing. • Kaustubh: ' It gives us energy to walk, run and lift things." • Shailaja: "It becomes a part of our body." • Jayasree: "It helps to fight diseases." • Aarti: "It is needed for the functioning of organs like the heart, brain and lungs." Who is 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.

What happens during interphase? (1)the nucleus grows to its full size. (2)the cell grows to its full size. (3)the nucleus divides into two nuclei. (4)the cell divides into two cells.

What must be done to breed dogs for a partical trait