C4.1

5. A method used to estimate the population size of mobile animals.
7. The S-shaped curve that represents the growth of a population over time.
11. A relationship where one species benefits at the expense of the host.
12. A relationship where both species benefit from the interaction.
17. Control of a population by the scarcity of resources like nutrients or light.
18. The phase of rapid population growth where resources are abundant.
20. Photosynthetic algae that live mutualistically within the tissues of coral polyps.
21. A community and its abiotic environment.

1. A group of populations of different species living and interacting with each other.
2. The maximum population size that an environment can sustainably support.
3. A close, long-term interaction between two different species.
4. A species that is naturally found in only one specific geographical area.
6. A sampling method used to ensure every part of an area has an equal chance of being studied.
7. The ability of an ecosystem to maintain its biodiversity and processes over time.
8. A square frame used to sample sessile or slow-moving organisms in a given area.
9. A group of organisms of the same species living in the same area at the same time.
10. The struggle between organisms for limited resources like food or space.
13. Control of a population by predators at a higher trophic level.
14. A non-native species that spreads widely and causes harm to an ecosystem.
15. Organisms that are fixed in one place and do not move.
16. An interaction where one organism hunts and eats another.
19. The ability of an infectious agent to cause disease in a host population.