Question

Protein is a primary building block of ____. Question 1 options: muscle skin eyes all of the above

Answer 1

Muscle (It is the primary source of building with the proteins)

Answer 2

Proteins are complex molecules found in the cells of living things and are the primary building blocks of muscle, skin, eyes and othe organs and tissues. They provide structure to the muscles, organs, skin and hair in the human body.This makes the correct answer D: all of the above.   Proteins work as enzymes, immune molecules, hormones and cellular messengers.  

This makes the correct answer D: all of the above. Proteins are complex molecules found in the cells of living things.