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

Section 2.1 Summary – pages 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

Section 2.1 Summary – pages 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

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

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

Section 2.1 Summary – pages 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

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

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

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

Section 2.1 Summary – pages 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

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

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

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

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

Section 2.1 Summary – pages 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.

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

Section 2.1 Summary – pages 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

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

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