The controls the materials that move into and out of a cell. cytoplasm
cell membrane
nucleus

membrane

Explanation:

its semi permiable meaning it only lets certain things go in and out

The cell membrane controls the materials that move into and out of a cell.

Explanation:

The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.

I hope this helps!

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3