This transportation process requires the cell to move particles from low concentration to high concentration.

1. active transport
2. osmosis
3. diffusion
4. facilitated diffusion

The chemical form of energy that is useable by the cell to do work

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.