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Chapter 3: Ecosystems
What Are They and How do They Work
12
Environmental Studies
12th Grade
02/03/2009

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Cards

Term
Ecology:
Definition
The study of how organisms interact with one another and with their nonliving environment
Term
Levels of organization of matter in nature (5 levels):
Definition
Organisms, Populations, Communities, Ecosystems, Biosphere
Term
Organism:
Definition
any form of life
Term
Species:
Definition
Groups of organisms that resemble one another in appearance, behavior, chemistry, and genetic makeup
Term
How many species on plant earth?
Definition
10-15 million
Term
Why are microbes key to keeping our population alive?
Definition
Microbes convert nitrogen gas in the atmosphere into forms that plants which produce foods (cheese, tofu)
Term
Population:
Definition
A group of interacting individuals of the same species occupying a specific area
Term
(populations) genetic diversity:
Definition
Individuals vary slightly in their genetic makeup, which is why they do not look alike or act alike
Term
Habitat:
Definition
The place where the population lives
Term
Distribution or range:
Definition
The area at which you find species
Term
Community (biological)
Definition
All the populations of different species that live and interact in a particular area.
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