Why might scientists study modern day organisms like birds to learn more about extinct organisms that lived millions of years ago?

Select the word from the list that best fits the definition a system made of 25 satellites

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

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.