Ecosystems

3. Occurring in large amounts
4. Non-living factors in an ecosystem
7. _______ use photosynthesis to create their own food
10. A resource that is critical for survival
11. _______ is when organisms benefit from interactions
13. Living factors in an ecosystem
14. _______ is one organism praying upon another organism
15. The environment where an organism lives
16. A natural area where living organisms interact with each other and non-living factors
19. _______ break down dead matter and return nutrients to the soil
20. _______ predator is the top of the food chain
22. _______ are needed by all living organisms for survival
24. The variety of different species in an ecosystem
25. A lack of rain or snowfall that can have a disruptive effect on an ecosystem

1. A species that is naturally found in an ecosystem
2. _______ species compete with native species for resources
5. Natural disasters have an ______ on ecosystems
6. A _____ chain shows how much energy moves through different organisms in an ecosystem
8. _______ is two or more organisms competing for the same resources
9. Animals that eat both plants and animals are called _____
12. In a food web, _____ consumers eat primary consumers
17. The building blocks of all living things
18. An animal that eats only plants is called a _____ consumer
21. Photosynthesis is the process by which green plants use _____ to produce food
23. _______ flows through through a food web