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In the tropics. skin that's darker contains a larger amount of a natural pigment called melanin. and the protection it provides is important because u.v. rays destroy budiman in the body that is important to subdivision for example during prenatal developement. up in the high north because u.v. radiation is so much weaker than in africa people of alt tabbing pale skin with less melanin. because the body also needs u.v. rays to produce the human team that plays an important role in building bones and helps ensure the immune system works optimally. if outlet is right right up in class only they ...

A question then just ask him and tell him he will send you a small surprise to send us your question by video text message over or smell we have to hear from you. to find us at d.s.w. dot com slash science or drop us a line at g.w. under school site tech. facebook d.w. science. theoretical physics is a complex subject that makes it all the more amusing that one of its heroes has become such a cultural icon albert einstein. animates his a new tricks book germany has brought the scientific genius back to life.