Juanita used her affinity for numbers in STEM class to help her design a computer program that relied on math formulas. Other students who disliked math seemed to struggle with the task. What is the meaning of "affinity” in this context?

an enjoyment of
a likeness or similarity
a close resemblance to
an understanding of

an enjoyment of likeness or similarity

Explanation:

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.