Final answer:
Keratin is the primary component of animal hair, as well as human skin, providing structure and protection. Collagen is found in connective tissues, contributing to the structure, whereas elastin and myosin have roles in tissue elasticity and muscle movement, respectively.
Step-by-step explanation:
Keratins are the type of fibrous proteins that constitute the bulk of animal hair. Keratin is also found in the outer layer of human skin and is valued for its protective qualities. In contrast, collagen is another type of structurally important protein present in connective tissues, such as skin, tendons, and ligaments. Collagen forms a significant part of the extracellular matrix (ECM) and provides structural integrity to various tissues. Myosin is involved in muscle contraction, while elastin gives elasticity to tissues like arteries and ligaments.