Why are the miller-urey experiments essential to the theory of evolution? a)they showed that life can only come from life. b)they showed that electricity can create life. c)they showed how organic molecules could be made from earth's early atmosphere. d)they demonstrated the role that natural selection played in the evolution of modern day organisms.

Duchenne muscular dystrophy is a serious condition caused by a recessive allele of a gene on the human x chromosome. the patients have muscles that weaken over time because they have absent or decreased dystrophin, a muscle protein. they rarely live past their twenties. how likely is it for a woman to have this condition? a) women can never have this condition. b) one-fourth of the daughters of an affected man would have this condition. c) one-half of the daughters of an affected father and a carrier mother could have this condition. d) only if a woman is xxx could she have this condition.

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution

What is the difference between a meteoroid and a meteor?