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1. Decomposers- an organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material.
2. Tertiary Consumers- those that eat the secondary consumers.
3. Secondary Consumers-  largely carnivores that feed on the primary consumers or herbivores.
4. Primary Consumer- make up the second trophic level.
5. Producers- any kind of green plant.
6. Biodiversity- the variety of life in the world or in a particular habitat or ecosystem.
7. Habitat- the natural home or environment of an animal, plant, or other organism.
8. Ecosystems- a biological community of interacting organisms and their physical environment.
9. Niche- the role an organism plays in a community.
10. Abiotic- a non-living part of an ecosystem that shapes its environment.

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- Difference between food webs and food chains
- Cycles of matter and what they do
- Ecology and the different types of consumers
- The importance of decomposers
- The different cycles of matter and what they do for our environment

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Ecology: Crash Course History of Science #38

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1. Explain why an ecosystem can’t make an unlimited supply of organic material
- Producers often cannot produce an unlimited supply of organic material because 1 or more nutrients are in short supply.
2. How do primary producers make their own food?
- Producers make their own food from carbon dioxide.
3. Explain how biotic factors can affect an ecosystem and abiotic factors
- Biotic factors such as autotrophs or organisms such as plants, and the diversity of consumers also affect an entire ecosystem.
4. Explain the difference between a food chain and a food web
- A food chain outlines who eats whom, and a food web is all of the food chains in an ecosystem.

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Ecology enriches our world and is crucial for human wellbeing and prosperity. It provides new knowledge of the interdependence between people and nature that is vital for food production, maintaining clean air and water, and sustaining biodiversity in a changing climate. The many specialties within ecology, such as marine, vegetation, and statistical ecology, provide us with information to better understand the world around us. This information also can help us improve our environment, manage our natural resources, and protect human health.