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Chapter 7
ch 21
Term | Definition |
---|---|
biosphere | the parts of earth and the surrounding atmosphere where there is life |
community | is all the populations of different species that live together in the same area at the same time |
population | is all the organisms of the same area at the same time |
competition | is the demand for resources,such as food, water, and shelter , in short supply in a community |
limiting factor | is anything that that restricts the size of a population |
population density | is the of a population compared to the amount of space available |
biotic potential | is the growth of a population if it could grown in perfect conditions with no limiting factors |
carrying capacity | a population grown until it reaches the carrying capacity of an environment as show |
normal polarity | state in which magnetic field reverses direction |
magnetic revrsal | ocurs and the magnetic field reverses direction |
reversed polarity | state in whitch magnetized objects would reverse direction |