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| Scientific hypotheses must be proposed in a way that.. |
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| enables them to be tested. |
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| may be revised or replaced |
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| Instrument used to seperate cell parts accoding to density |
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| a contolled experiment allows the scientist to isolate and test |
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| process by which organisms keep their internal conditions fairly constant |
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| A group of organisms of one type living in the same place |
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| a group of cells tahat develop from a single original cell |
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| an intrument that allows light to pass through the specimen and uses two lenses |
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| compound light microscope |
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| seperate different cell parts |
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| space surrounding the nucleus contains |
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| electron which forms bonds |
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| When an stom loses electrons the atoms are |
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| enzymes affect the reactions in cells by changing the |
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| atoms of the same element with the same number of protons and different number of elections |
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| solutions that contain concentrations of H+ ions lower than pure water |
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| main source of energy for living things |
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| name given to the idea that life could arise from nonliving matter |
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| chemical reactions through which organisms build up or break down materials as it carries out life processes |
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| stomach produces this to digest food |
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| a chemical bond formed by the transfer of electrons |
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| simplest grouping of more than one kind of organism in the biosphere |
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| process by which bacteria convert nitrogen gas in the air to ammonia |
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| movements of energy and nutrients through living sstems are different because |
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| energy flows in a one direction and nutrients recycle |
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| combined portions of earth in which all living things exist |
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| repeated movement of water between earths surface and atmosphere |
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| chemistry of aquatic ecosystems is determined by |
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| amount of salts, nutrients and oxygens dissolved in water |
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| temperatures on earth remain within suitable range for life beacause of |
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