Which of the following gives the skin form and strength?

Collagen is a crucial protein found in the skin that provides structure, strength, and elasticity. It forms the scaffolding that supports the skin, helping it maintain its shape and resist sagging. As the most abundant protein in the body, collagen fibers create a network that gives skin its firmness and resilience, making it vital for overall skin health and youthfulness.

While other substances like elastin are also important for skin elasticity, collagen is primarily responsible for its structural integrity and strength. Keratin serves a different function, mainly adding toughness and water resistance to the outer layers of the skin, while hyaluronic acid is known for its hydrating properties but does not provide structural form or strength. Therefore, collagen is the key component that directly contributes to the skin's firmness and structure.