Which is most likely a source of air pollution?
littering
CFCs
oil spill
runoff

The tubes transporting minerals and water upward are called ?

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?