Why does a balloon, filled with hot air, shrink when cooled in ice water? A.
The inside and outside forces balance out and crush the balloon

B.
The atmosphere exerts pressure on the inside of the balloon and shrinks it.

C.
The drop in temperature reduces the volume of the balloon.

D.
Gravity creates a force that crushes the balloon.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

haha

it's made from mineral oil