Energy. A solute can only move against concentration gradients using active transport which requires energy
A- Gravity. I believe it is gravity since that is the only one that makes sense in this situation. I hope i helped! :)
I think the answer may be D. But don’t answer yet, I may be wrong.
Answer: Respiration is a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.
Hence, respiration helps to maintain a persons health.
Answer:
plants are the main producer in a forest
Explanation:
because if the herbivores don't get their food then they die, and if they die carnivores die and there is no more forest
