science

2. a number of food chains combined
4. what a food chain starts of with
5. the place where all life as we know exists. It consists of Earth and its atmosphere
6. A group of organisms of the same species living in a community
9. the green pigment
13. A group of organisms which are all different species living together in an ecosystem
14. organisms co-operate with each other to ensure their survival
15. close and physicial relaisonship between two organisms of different species
16. occurs when organisms compete for the same resource.
17. a system formed by organisms interacting with each other and their nonliving surroundings in a balanced way

1. animals eating other animals
3. a human made system of plants, animals, and people living in an area together with their surroundings.
7. when one organsism benefits and lives off a body and the other is harmed
8. members of the same species produce offspring, ensuring that their species will survive
10. animals that are eaten
11. in which organelle photosynthesis occurs
12. All living things (organisms) have a place where they live