Answer:
so do i
Explanation:
I'M SO ALONEEEE I have to add more so ignore this jrjenenrjejsgjsmjdjfnajs
I think it is the first one
The integumentary system, the skin, protects the internal organs from harmful bacteria, sunlight, and injury. The skin is the largest organ of the body and consists of two layers: the epidermis and the dermis. The epidermis is the outer layer. It is made up of dead cells and new cells which make the body waterproof, give color to the skin, and help maintain the body's hydration levels.
Carbon dioxide, and Sulfur dioxide, because you have to know what gas are very dangerous and which ones arent........
