- Animals eat other organisms — Animals cannot produce their own energy without consuming other organisms.
- Birds considered as consumers — Birds eat plants.
- We see some animals in different food chain — because some animals consume more than one type of organism.
- Some animals may live side by side — There is a limited amount of space found in ecosystems.
- The best statement that explains why do organisms need energy — Energy is necessary for cells to function.
This are the required answers based on the food chain and ecosystem.
If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D