Which are characteristics of epithelial cells? Select two options. ( ANSWER ASAP PLEAS) 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

The characteristics of epithelial cells include they are found lining many

areas that contact the external environment and play a role in protection.

Epithelial cells are found in the outermost layer of the body and they include the skin, nails , hair etc.

These cells are found lining many areas of the body from contact with

external environment to prevent infection and death. They also help protect

the body cells from external factors such as sharp objects and other

pathogenic organisms.

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the answers are a and c

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave