Chapter 7 Environmental Science

2. An organism that lives in or on another organism and feeds on it.
5. A range of conditions in which a species can survive.
7. A relationship in which one species benefits and the other species is neither harmed nor helped/
9. The arrangement of a populations individuals in a space
10. Populations grow faster and faster.
14. When a natural resource is being used at the same rate the resource is produced.
16. The set of individuals within a species living in the same place at the same time.
17. A certain proportion of a population is affected regardless of the populations density.
18. The organism a parasite takes its nourishment from.
19. A location in which a species lives.
21. The relationship between a parasite and its host.
25. If two species have requirements that are too similar, one species may eliminate the other from a habitat.
26. Incidents occur more quickly in a crowded population than a sparse population.
27. The number of deaths per year.
28. The population size where birth rates and death rates are equal.

1. The maximum number of offspring that each member of the population can produce.
2. The interaction of a predator feeding on prey.
3. A relationship in which two species live in close association.
4. The average time it takes a member of the population to to reach the age when it reproduces.
6. A relationship in which different individuals or populations attempt to use the same limited resource.
8. Occurs when each species uses less of the niche that it is capable of using.
11. An organism that is feed upon.
12. The birth rate minus the death rate.
13. An area defended by one or more individuals against other individuals.
15. An organism that feeds on another organism.
20. The number of births per year.
22. The fastest rate at which a population can grow.
23. A close relationship between two species in which each species provides a benefit to the other.
24. The number of individuals per unit area or volume.