What planets are you talking about? Well, the one with a good level of oxygen ( allows humans to breath and forms the ozone layer that protects us from the Suns harmful rays) and hydrogen( mixes with oxygen to make water). The suns impact on the planet affects the whole life on it, so you need to take that into consideration. List me the four planets and I can give you a much better explanation.
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I'm sorry no one was there for you when you asked this question :(
True, if you are 50 and time your age by BMR
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.
