21 the most external skin region is composed of: a dense fibrous connective tissue b simple columnar…

Brief Explanations:

The outermost layer of the skin is the epidermis, which is composed of stratified squamous epithelium. This type of epithelium provides protection against mechanical stress, pathogens, and dehydration. Dense fibrous connective tissue is found in deeper layers like the dermis. Simple columnar epithelium lines organs like the intestines. Adipose tissue is for energy - storage and insulation in the hypodermis. Areolar tissue is a loose connective tissue found beneath the epithelium in some areas but not in the outermost skin layer.

Answer:

D. stratified squamous epithelium