Identify work or a task that you’d like to make easier by using a device or tool. Here are a few possibilities: Easily pick up paperclips or pins that have fallen on the floor.
Make a bed in less time.
Move laundry from a basket into a washing machine without bending down.
Sweep the floor without bending down.
Rinse a collection of dishes at the same time.
Efficiently pass salt and pepper shakers around a table.
Rescue somebody from a high place.

Choose a task from the list or, better yet, come up with your own. Explain how your tool or device will make the task easier. Note the simple machines that the tool or device will use.

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.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.