When does the cell have to use active transport

a) when the cell is low on energy

b) when the cell is in a highly concentrated solution

c) to move molecules across the membrane quickly

d) to move molecules across the membrane against a gradient

Pls ! in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.