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Answer: Since leg bones are important to our body structure, biomedical engineers design prosthetic legs to handle the stresses It should also last a very long time, so that the patient does not need multiple knee replacements.

Explanation:

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The 4 categories of macromolecules include carbohydrates, proteins, lipids, and nucleic acids. Carbohydrates (grains and vegetables) are the largest group at the base of the pyramid, proteins (milk, poultry, eggs, nuts) follow up the pyramid while lipids (fats and oils) are the least amount at the summit of the pyramid.

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