1. define the following terms: 2. producer 3. primary consumer c 4. secondary consumer d 5. tertiary consumer 6. decomposer 7. law of conservation of matter as it relates to a food chain 8. food web 9. primary succession 10. secondary succession 11. pioneer species 12. symbiosis 13. bioluminescence 14. organism 15. population (as it relates to levels of organization) 16. community (as it relates to levels of organization) 17. ecosystem 18. climate vs. weather 19. el nino 20. indigenous vs. nonindigenous species 21. invasive species 22. endangered 23. extinct

1. Producer-an organism that makes its own food (like plants)
2. Primary consumer-are herbivores
3. Secondary consumer-carnivores and omnivores
4. Tertiary consumer-carnivores at top level in food chain and only feeds on secondary consumers
5. Decomposer-organism that breaks down dead decaying matter and turns them in nutrients 
6. Matter is neither created or destroyed
7. A bunch of food chains linked together
8. Occurs in an empty habitat
9. Started by a natural event
10. Organisms that return after a disturbance in the ecosystem
11. Relationship between two different species
12. Production of light by an organism
13. An animal, plant, or bacteria
14. A group off organisms that interbreed in and live in the same place at the same time
15. Different species working together in an ecosystem
16.  A community of organisms interacting with each other and their environment
17.  Climate is weather changing over a long period of time while weather is what the atmosphere is like right now
18. Climatic changes affecting the Pacific regions
19. Indigenous is being a native of a place naturally while nonindigenous is placed there because of humans 
20. A species that is an alien to the place and can cause harm to the environment that they are in
21. Species seriously at risk of going extinct
22. Means that a species is no longer in existence

Hope this helps!! :)