1. BELLRINGER: 1. List five reasons why organisms would compete with each other. Put this in the second box of your bellringer page

2. Section 2.1 Summary – pages 35 - 45 Ecology is the study of interactions that take place between organisms and their environment. (Where they live, what they eat, and what eats them) SHARING THE WORLD

3. Section 2.1 Summary – pages 35 - 45 In Biology we study the portion of Earth that supports life- Biosphere It extends from high in the atmosphere to the bottom of the oceans. BIOSPHERE

4. Section 2.1 Summary – pages 35 - 45 Ecologists have organized the living world into levels— the organism by itself population community and ecosystem LEVELS OF ORGANIZATION

5. Section 2.1 Summary – pages 35 - 45 An individual living thing that is made of cells, uses energy, reproduces, responds, grows, and develops. LEVELS OF ORGANIZATION ORGANISM

6. Section 2.1 Summary – pages 35 - 45 A population is a group of organisms, all of the same species, which interbreed and live in the same area at the same time. LEVELS OF ORGANIZATION POPULATION

7. Section 2.1 Summary – pages 35 - 45 LEVELS OF ORGANIZATION COMMUNITY A biological community is made up of interacting populations in a certain area at a certain time.

8. Section 2.1 Summary – pages 35 - 45 A change in one population in a community may cause changes in the other populations. COMMUNITY

9. Section 2.1 Summary – pages 35 - 45 Biological communities that interact with each other in a given area and with the abiotic components of that area. LEVELS OF ORGANIZATION ECOSYSTEM

10. Section 2.1 Summary – pages 35 - 45 A relationship between organisms of different species is called symbiosis. Four kinds of symbiosis are recognized: 1. mutualism, 2. commensalism, 3. parasitism, 4. predator/prey. SYMBIOSIS

11. Section 2.1 Summary – pages 35 - 45 A symbiotic relationship in which both species benefit is called mutualism. SYMBIOSIS Mutualism

12. Section 2.1 Summary – pages 35 - 45 Commensalism is a symbiotic relationship in which one species benefits and the other species is unaffected. SYMBIOSIS Commensalism

13. Section 2.1 Summary – pages 35 - 45 A symbiotic relationship one species benefits and the other is harmed is called parasitism. SYMBIOSIS Parasitism

14. Section 2.1 Summary – pages 35 - 45 Parasites have evolved in such a way that they harm, but usually do not kill the host species. SYMBIOSIS Parasitism Tape Worms in Intestine

15. Section 2.1 Summary – pages 35 - 45 In a predator and prey relationship one species is benefitted and the other is killed. Predators seek out and eat other organisms. Predation is found in all ecosystems and includes organisms that eat plants and animals.

18. Section 2.1 Summary – pages 35 - 45 A habitat is the place WHERE an organism lives out its life. ORGANISMS IN ECOSYSTEMS

19. Section 2.1 Summary – pages 35 - 45 A niche is the WAY an organism lives out it’s life— how it meets its specific needs for food and shelter how it survives, and where it reproduces in its environment. ORGANISMS IN ECOSYSTEMS

20. Section 2.1 Summary – pages 35 - 45 Why is thought that two species can’t exist for long in the same community if their niches are the same? ORGANISMS IN ECOSYSTEMS

21. Table of Contents: Symbiosis Notes Attach the notes on page 4