Is this a scientific model? use complete sentences to explain why or why not.

Yes

Explanation:

This is a scientific model because it depicts a scientific activity that either the world can't understand or experience by themselves. The water cycle shows how precipitation, condensation, and evaporation all occur to keep the cycle of water flowing, which is something that cannot be seen by the human eye regularly. That is why it is a scientific model.

coal is not sustainable because it will one day run out.

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.