unit 8

2. the variety of life on Earth at all its levels, from genes to ecosystems
3. a group of organisms that can reproduce naturally with one another and create fertile offspring.
6. a type of symbiotic relationship where all species involved benefit from their interactions.
10. two species cannot coexist in the same ecological niche for very long without one becoming extinct or being driven out because of competition for limited resources.
11. a resource is a substance or object in the environment required by an organism for normal growth, maintenance, and reproduction.
13. the evolution of a biological community's ecological structure
18. a living organism that shapes its environment
19. organism that breaks down dead organic material
20. a system of nomenclature in which each species of animal or plant receives a name of two terms

1. an organism that feeds on dead and decomposing organic matter.
4. any relationship or interaction between two dissimilar organisms
5. an organism that can produce its own food using light, water, carbon dioxide, or other chemicals
7. an area classified according to the species that live in that location.
8. a non-living part of an ecosystem that shapes its environment.
9. the role an organism plays in a community
12. the area and resources used by a particular species
14. a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter.
15. plants and animals recolonize a habitat after a major disturbance
16. an organism that regularly consumes a variety of material, including plants, animals, algae, and fungi.
17. animals that get their energy by eating plants or other animals