What effect does studying with music have on student test scores? Hypothesis:
Independent variable:
Dependent variable:
Control variable:

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.

it would be rhyolitic hope this

a physical change is being made.