1. KEY CONCEPT Every organism has a habitat and a niche.

3. food

4. abiotic conditions

7. The niche will be divided.

9. Competition and predation are two important ways inwhich organisms interact. Competition occurs when two organisms fight for thesame limited resource. Intraspecificcompetition Interspecificcompetition Where else have we used “intra” and “inter” In Biology this year?

14. KEY CONCEPT Populations grow in predictable patterns.

15. Changes in a population’s size are determined by immigration, births, emigration, and deaths. The size of a population is always changing. Why? Four factors affect the size of a population. immigration births emigration deaths

16. Population growth is based on available resources. Exponential growth is a rapid population increase due to an abundance of resources. What would you expect to happen after exponential growth?

17. Logistic growth is due to a population facing limited resources. What do you suppose the carrying capacity is?

19. competition

21. natural disasters

23. What does the term ecological equivalents describe? A. species that occupy the same niche in the same community B. species that occupy similar niches in different geographical regions C. species that occupy different niches in the same habitat D. species that occupy different niches in different geographical regions Correct Answer = B What is the habitat of a zebra? A. African savannah B. tropical rain forest C. wetland D. mountainside

24. What does the term ecological equivalents describe? A. species that occupy the same niche in the same community B. species that occupy similar niches in different geographical regions C. species that occupy different niches in the same habitat D. species that occupy different niches in different geographical regions Correct Answer = B What is the habitat of a zebra? A. African savannah B. tropical rain forest C. wetland D. mountainside Correct Answer = A

25. Review A habitat defines the biotic and abiotic factors in an organism’s surroundings A niche includes the habitat and all other factors a species needs to survive, be healthy, and reproduce Competition over resources structures a community. Symbiotic relationships include mutualism, commensalism, and parasitism. Changes in population sizes arise from immigration, births, emigration, and deaths. Population growth is typically limited by resource availability.