Proteins are used as the building blocks of most living tissue.

A. true'
B.false

True

The correct answer is A. true.

Proteins are indeed used as the building blocks of most living tissue. Proteins are macromolecules made up of chains of amino acids. They play numerous critical roles in the body, including providing structure and support to cells and tissues, acting as enzymes to facilitate biochemical reactions, helping with the transport and storage of molecules, and serving as signaling molecules.

To verify this answer, you can consult reliable scientific sources such as biology textbooks, academic journals, or trusted educational websites that explain concepts of biology and biochemistry. These sources will provide you with more in-depth information about proteins and their role as the building blocks of living tissue.