Final answer:
Loose connective tissue and fibrous connective tissue have different arrangements of protein fibers in their matrix ground substance.
Step-by-step explanation:
Loose connective tissue and fibrous connective tissue have different arrangements of protein fibers in their matrix ground substance. In loose connective tissue, the protein fibers are loosely organized, leaving large spaces in between them. This makes the tissue flexible and allows for movement. In contrast, fibrous connective tissue has bundles of protein fibers that are tightly packed together, providing strength, elasticity, and protection.