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20 Cards in this Set
- Front
- Back
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Population |
A group of organisms of the same species that live in the same area.For example, a desert will have populations of different species of lizards and cactus plants. |
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Population Dynamics |
The study of the changes in the number of individuals in a population and the factors that affect those changes. |
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Carrying Capacity |
The largest size that a population can reach in an ecosystem. |
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Population Size |
The number of individuals in a population at a given time. |
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Population Density |
A measure of the number of organisms that live in a given area. The population density of a city may be given as the number of people living in a square kilometer. |
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Range |
The large geographic area where a population lives. |
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Competitor |
A species that is often compared to an opportunist species. How does it compare? Its life span is longer. It has fewer offspring. |
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Immigration |
In population studies, the movement of an organism into a range. The range is inhabited by individuals of the same species. |
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Emigration |
In population studies, the movement of individuals out of an ecosystem. |
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Limiting Factor |
A factor or condition that stops the continuing growth of a population in an ecosystem. |
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Oppertunist |
A species that is often compared to a competitor species. How does it compare? Its life span is shorter. It has large numbers of offspring. |
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Extinction |
The disappearance of a species with no chance of its coming back. |
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Habitat |
The natural environment in which a living thing gets all that it needs to live. A desert is a habitat. A coral reef and a freshwater lake are, too. |
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Pollution |
The giving off or the presence of harmful substances into the air, land, or water. |
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Absolute Age |
The age in years of an event or object. This is the true age. |
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Fossil |
A trace or the remains of a once-living thing from long ago. |
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Mass Extinction |
One of several periods in Earth’s history when large numbers of species became extinct. They became extinct at nearly the same time. |
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Multicellular |
Made up of multiple cells. |
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Relative Age |
The age of an event or object as compared to other events or objects. |
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Unicellular |
Made up of a single cell. |
