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13 Cards in this Set
- Front
- Back
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What is population?
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A group of organisms that belong to the same species and live in the same area.
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Exponential Growth
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growth that starts slowly but can shoot out of control rapidly.
Charecterized by a fixed doubling time. (=70/Rate of Growth) |
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Logistic growth
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initial growth, exponential growth,slowing points, carrying capicity, steady state
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density dependent limiting factors
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competition
crowding parasitism depends on how big the population is and how close they live |
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density independent limiting factors
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flood
fire drought natural occurences that factor into population size |
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carrying capacity
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the maximum number of an organism that a given ecosystem can support
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J-curve
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when a population extends its carrying capacity and begins to collapse (decline)
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Isotopes
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atoms with same # of protons but different # of neutrons
atoms of the same element (atomic #) but different mass numbers |
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Ionic chemicle bonds
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electrons transferred from one atom to another
charges no longer balanced atoms become ions (one positivly charged, one negativly) |
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Covalent chemicle bonds
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electrons shared between atoms
nucleus of each has equal attraction for electrons shared electrons spend most time between the two atoms |
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alpha radiation
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nuclei of fast moving helium particles
charge is +2only travel a few inches in air shielded by paper or dead skin |
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beta radiation
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fast moving electrons
charge is -1 travel feet in air sheilded by plastic, glass, or alluminum |
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gamma radiation
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electromagnetic radiation of high frequency
charge is 0 can travel indefinitly shielded by lead, concrete, or water |
