Read the section “gaining biodiversity.” describe geographical isolation and competition. (site 2) gaining and losing biodiversity globally, the natural mass has decreased over time, although the great mass extinctions have decreased it for a while. the most famous of the mass extinctions is the one claimed to be the dinosaurs, but we are currently in the midst of a human-created mass extinction. local diversity, on the other hand, is constantly increasing and decreasing at very short time scales. there are many factors that affect diversity, and the best natural circumstances are given here. human-generated, in, have always been negative, and are covered in the conservation issues section.

answer; /// i believe that the correct answer is (50%);

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.