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| a physical enviornment with different species that interact with one another and with nonliving things |
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| is the maintenance of constant internal conditions in an organism |
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| is the change in living things over time |
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| an inherited trait that gives an advantage to individual organisms and is passed on to future generations |
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| includes uses our senses to study the world, but it may also involve other tools |
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| observations that also can be recorded as data that can be analyze |
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| a proposed answer for a scientific question. must be specific and testable. |
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| scientists study factors called independent variables and dependent variables to find cause-and-effect relationship |
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| an experiment is a condition that is manipulated,or changed,by a scientist |
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| observed and measured during an experiment;they are the experimental data |
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| the conditons that do not change during an experiment |
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| a proposed explaination for a wide range of observations and experimental results that is supported by a wide range of evidence |
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| the smallest basic unit of matter |
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| one particular type of atom,and it can't be broken down into a simpler substance by ordinary chemical names |
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| a substance made of atoms of different elements bonded togther in a certain ratio |
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| an atom that has gained or lost one or more electrons |
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| forms through the electrical force between oppositely charged ions |
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| forms when atoms share a pair of electrons |
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| two or more atoms held together by covalent bonds |
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| an attraction between a slightly positive hydrogen atom and a slightly negative atom,often oxygen or nitrogen |
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| attraction among molecules of a substance |
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| attraction among molecules of different molecules |
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| a mixture of substances that is the same through-out-it is a homogeneous mixture |
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