Final answer:
The most obvious structural feature of areolar connective tissue is the gel-like ground substance that gives the tissue its loose consistency and flexibility.
Step-by-step explanation:
The most obvious structural feature of areolar connective tissue is its gel-like ground substance. This matrix fills the space between the formed elements of the tissue and gives it a loose consistency that is similar to a cotton ball that has been pulled apart. Areolar connective tissue includes a variety of components such as collagen fibers, elastic fibers, and fibroblasts, but it is the gel-like ground substance that contributes significantly to its function and structure, providing the tissue with toughness yet allowing for flexibility.