Question

which are characteristics of epithelial cells? select two options. are unable to be used for secretion of materials main cells of the nervous system found lining many areas that contact the external environment plays a role in protection carry oxygen through the body make up the skeletal muscle

Explanation:

Epithelial cells line areas like the skin (which contacts the external environment) and serve protective functions (e.g., skin protecting internal tissues). They can secrete (e.g., goblet cells secrete mucus), neurons are main nervous - system cells, red blood cells carry oxygen, and muscle cells make up skeletal muscle.

Answer:

C. found lining many areas that contact the external environment, D. plays a role in protection