Which is true of a kilogram of feathers and a kilogram of bricks? a. they have the same mass b. they have the same volume c. the bricks are less dense d. the feathers are more dense

Which statements best describe the work of marie and pierre curie? check all that apply. they discovered radioactivity. they came up with the term “radioactivity.” they conducted experiments with uranium-containing minerals and pure uranium. they conducted experiments with uranium-containing minerals and photographic plates. they discovered two new radioactive elements.