It is made of cells. It acts as a barrier. It is made of tissues. It is part of an organism.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The skin is the largest organ in the human body. Why is skin considered to be an organ?
Possibilities:
- It is made of cells.
- It acts as a barrier.
- It is made of tissues.
- It is part of an organism.

It is made of tissues.