Question

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protein is a primary building block of
○ muscle
○ skin
○ eyes
○ all of the above

Explanation:

Protein is essential for building and repairing tissues. Muscle tissue, skin (which has protein - rich structures like collagen), and eyes (e.g., proteins in eye structures) all rely on protein as a primary building block. So the correct option is the one that includes all these.

Answer:

D. all of the above (assuming the options are labeled A: muscle, B: skin, C: eyes, D: all of the above)