Montreal Protocol is the correct answer I think
Not my drawing and labeling but this is a clear picture of it.
Source:
http://leavingbio.net/amoeba/
Answer:
A cell uses active transport because active transport uses energy going from high to low (against the concentraion gradient) while diffusion (passive transport which doesn't use energy) goes from low to high.
Explanation:
Answer:
water sunlight air and vaiabilty