<span>it's because the part of your brain that recieves information from your sensory neurons dosen't treat all the body equally.</span>
They are heterotrophic- not photosynthetic because they cannot perform photosynthesis
<span>UV radiation has a penetration power that can go down to the dermis, when UVA, or to the deepest layer of the epidermis, when UVB. UVA and UVB are the type of radiation that's the most potentially dangerous for DNA damaging to happen. Melanin absorbs the UV rays reducing the damage that these may produce to the living cells of the dermis and deeper, just bellow these granules.</span>
