Week 33 work book

3. a symbiotic relationship that involves one organism living with on or inside an another organism and harming it.
8. the first species to populate an area.
9. the behaviors or interactions between different organisms.
11. a symbiotic relationship where both species benefit.
13. a species that influences the survival of many other species in an ecosystem.
14. something indigenous to a particular locality, but can be found naturally in other areas.
15. the number and variety of different species in an area.

1. an interaction in which one organism kills another for food or nutrients.
2. the struggle between organisms to survive as they use the same limited resources.
4. a symbiotic relationship in which one species benefits and the other species is neither helped nor harmed.
5. a species that has been introduced to an ecosystem that outcompete native species for resources.
6. when both organisms of a mutually beneficial symbiotic relationship needs the other for survival.
7. the series of predictable changes that occur in a community over time.
10. any relationship in which two species live closely together.
12. The disappearance of all members of a species from the Earth.