"while you and your friend are walking through a natural history museum, she points out the skull of an australopithecine with a large crest on the top and asks you what its purpose was. how might you correctly sum up this complicated evolutionary trait for your friend?

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.