Question

Which statement is true about the skin?

The skin is part of the endocrine system; it serves to protect the body.
The skin is an important part of the integumentary system; it keeps the body from drying out.
The skin is an important part of the immune system; it is a part of the second line of defense.
The skin is an important part of the lymphatic system; it secretes sweat and mucus.

Answer 1

It would be the second answer.
The skin is an important part of the integumentary system, it keeps the body from drying out.
It is the 1st line of defense.

Answer 2

the skin is the important part of the integumentary system (main part actually)