I would say hat now is the perfect time because peak bone mass happens at our age. Bone strengthening exercises are always good for your body no matter what, so encourage her/him to do it. I'm guessing the age is about 11-18 maybe...
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The healthiest option would be the cheese because cheese contains both healthy and non-healthy fats, the second best choice would be nuts, although they contain more protein than fat.
Answer:
D. gene - chromosome - nucleus
Explanation:
From largest to smallest:
Cell, Nucleus, DNA, Chromosome, Gene