"Topic 7 - Populations, Communities, and Ecosystems": HTML5 Crossword

Across

4. a type of symbiosis between two species in which one species benefits and the other species is neither helped nor harmed. (12)
6. the practice of helping a degraded or destroyed ecosystem recover from damage. (10,11)
9. a type of symbiosis in which one organism lives with, on, or in a host and harms it. (10)
10. the study of how organisms interact with each other and their environment. (7)
11. the first species to populate an area during succession. (7,7)
13. the ability of an ecosystem to maintain biodiversity and production indefinitely. (14)
14. species that are not native to a habitat and can out-compete native species in an ecosystem. (8,7,0)
16. a type of symbiosis in which both of the species benefit from living together. (9)
17. how an organism makes its living and interacts with the biotic and abiotic factors in its habitat. (5)
18. the struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time. (11)

Down

1. anything naturally occurring in the environment that humans use. (7,9)
2. an interaction in which one organism kills another for food and nutrients. (9)
3. a species that influences the survival of many other species in an ecosystem. (8,7)
5. the number and variety of different species in an area. (12)
6. the disappearance of all members of a species from Earth. (10)
7. the benefits that humans derive from ecosystems. (9,8)
8. the series of predictable changes that occur in a community over time. (10)
12. any relationship in which two species live closely together and that benefits at least one of the species. (9)
15. the practice of using less of a resource so that it can last longer. (12)