Answer: Plant kingdom!
Explanation: Most plants use sunlight to make food with photosynthesis but others, like the Venus fly trap, consume other organisms. Good luck! :D
Answer:
Osmosis
Explanation:
Water moves across cell membranes by diffusion, in a process known as osmosis.
I would say energy myself, and this is because energy plays a key role in all of these. With trophic levels energy is being transferred amongst the levels. Food chain's is a map of how the energy is passed along the chain. Food web is a web of how energy is transferred, and this is why I would say energy is a keyword.