HELP PLEASE ASAP WILL GET 10 points When muscles in animals are exercised extensively in the absence of sufficient oxygen,

A. lactic acid is produced.

B. large amount of ATP is formed.

C. ethyl alcohol is produced.

D. NADH molecules move to the heart.

Aeukaryotic cell must be from a plant if the cell a) a nucleus b) a nuclear envelope c) cytoplasm d) a cell wall

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.

An easy way to calculate the amount of energy available at each level is to what?