They contain symbiotic bacteria called rhizobia within nodules in their root systems, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants; this helps to fertilize the soil.
All plant and animal groups existing together and the physical factors with which they interact compose an ecosystem<span>.</span>
The second one
One gene for a particular trait
Although now it causes more harm than good because it doesn't really have a purpose, it is believed it once was used for humans to digest bone.
Answer:
the process by which green plants turn carbon dioxide and water into food using energy from sunlight
