It is the job of the respiratory system to a. support the body and allow movement b. transport nutrients and oxygen throughout the body c. exchange air between the environment and the body d. breaks down food to get nutrients

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 stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human