In a scientific experiment, how
many variables
should be changed
during the
experiment?
A. only one
B. about 3 or 4
C. a dozen or more
D. as many as possible

Aflame cell is at the end of each tubule of the nephridium malpighian tubules kidneys none of the above

What pattern of migration do whales follow?

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.