I believe it is A.Simple epithelia form impermeable barriers. If I am not right I'm really sorry. I don't really know much about it :)
This, though a broad statement, is true as far as I can tell.
Every cell in our body has chromosomes.If it has xx combination of chromosomes then it has female characteristics and if it has xy chromosomes then it has male characteristics.....
HOPE IT HELPS YOU '_'
The skin graft helps by covering the wound and protecting it from fluid loss. it also aids in temperature regulation and helps prevent disease causing bacteria or viruses from entering the body.