In a beach ecosystem, what can limit growth of organisms?
a. ocean and rocks
b. oxygen
c. abundant food source
d. moderate temperatures

the correct answer is b oxygen because the larger an organism gets the more it needs to sustain themselves therefore if a fish that gets its oxygen from the particles in the water well it might not be able to get a sufficient amount of oxygen from the water since its growing and requires more

albert einstein retrieved guacamole from the galapagos islands in africa

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.