Final answer:
Collagen fiber is the most abundant fiber in connective tissue, providing strength to the tissue.
Step-by-step explanation:
The most abundant fiber in connective tissue is collagen fiber. Collagen fibers provide strength to the tissue, preventing it from being torn or separated from the surrounding tissues. Collagen fibers are a crucial component of the extracellular matrix in connective tissues, providing strength, structure, and support to various tissues in the body. Collagen is the most abundant protein in the human body, and it is a key element in maintaining the integrity and functionality of tissues. There are different types of collagen, but all share a common triple-helical structure.