All organisms require certain nutrients for survival and reproduction. suppose a particular bacterial population thrives only in the top five millimeters of lakes. suppose a microscopic plant population also thrives only in the top five millimeters of lakes. when the bacterial and plant populations are floating together, the bacterial population is reduced to 20% of the number it was when floating in the absence of plants. what does this situation likely illustrate?

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.

the backbone of the dna and rna compound is sugar phosphate.