Which materials are composed of proteins, providing high tensile strength?

Muscles are materials that are composed of many flexible and contracting cells and tissues that helps the human body to move, generate involuntary or voluntary movement or motion. 

These are composed of many high tensile strength that is developed by the cells that generate important proteins for the muscle to work and process. 

Wikipedia aswell can be used to solve the following questions

The answer is c) organisms that are sensitive to changes in temperature would die.