The skin IS considered a organ as it is apart of the integementry system. And it is the largest organ in the body. The skin has a epidermal layer, a dermal layer, fatty tissue, and several other associated factors.
The answer would be D because the proportion is 6:9, which could be simplified to 2:3
Exfoliation is the process of a tooth becoming loose and falling out from the primary dentition, I'm pretty sure.
Hope this helps^^^
B. makes the most since. So im going to go with B
