_____ are the basic material and building blocks of the body's tissues.

Proteins serve as the fundamental materials and building blocks of the body's tissues due to their essential role in maintaining and repairing cells and tissues. They are composed of amino acids, which are organic compounds that link together to form proteins. The body uses various proteins for numerous functions, including the formation of muscles, skin, enzymes, hormones, and other critical components necessary for life.

While carbohydrates, fats, and minerals play important roles in the body, they do not possess the same structural capabilities as proteins when it comes to forming tissues. Carbohydrates primarily provide energy, fats are crucial for storing energy and supporting cell membranes, and minerals facilitate various biological functions and support overall bodily health, but none of these substances can replace the role of proteins in building and repairing body tissues.