Bell Ringer From the video Monday, pick one segment and describe the relationship between the organisms in that segment. Your description should be 5-7 sentences.

Ecosystems What makes you live?

Essential Questions What are biotic and abiotic factors? What roles do organisms play in an ecosystem?

Factors in an Ecosystem Abiotic factors are the non-living factors in an ecosystem Biotic factors are the living factors or once living factors in an ecosystem Make a T-chart on your paper and take one minute to list as many biotic and abiotic factors you can think of.

Ecosystems An individual is a single organism in an environment. Individuals of the same type in the same environment are called a population. All the types of populations living together in a environment make up a community.

Together, a community and a physical location make up an ecosystem. A limiting factor affects the population of an ecosystem. Ex. Food, water, shelter Population Density is the number of organisms an ecosystem can support.

Check your learning What are biotic factors What are abiotic factors Describe an ecosystem Identify each as biotic or abiotic

Ecosystem Because there are limited resources in an ecosystem, there can be competition. Animals have developed traits over time to help them compete.

Interdependence Organisms in an ecosystem are interdependent, meaning they depend on each other for survival. Each population of organisms has a niche. A niche is the specific role that an organism has an ecosystem.

Food for Thought What niches do you fit in? What niches could organisms have in an ecosystems?

Niches and Roles A producer is an organism that produces its own food. A consumer is an organism that eats producer or other consumers. A decomposer breaks down other organisms.

Food Chain A food chain shows the flow of energy through an ecosystem. The SUN is the origin of all energy on Earth! Producers are always the the first level after the sun.

Food Chains

Food Web A Food Web shows how all food chains are connected.

Exit Slip What are abiotic factors? What are biotic factors? Label each of the following pictures as producer, consumer, or decomposer. Please put one question you have about what was covered today!