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Definition
| Physical or nonliving parts of an enviroment |
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| Actual age of a rock or fossil |
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| Sudden change in the electrical charge of a neuron |
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| Equal but opposite forces that objects excert on each other |
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Definition
| Movement of molecules through the cell membrane against a concentration gradient, requireing the cll to use energy |
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| A trait that improves an organism's chance for survival and reproduction |
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| mutations that make an organism better suited to its enviroment |
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| body of air that has a certain temperature, moisture content, and pressure |
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| product of radioactive daecay that consists of 2 protons and 2 neutrons |
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| Molecules of carbon, hydrogen, oxygen, and nitrogen that serve as the building blocks of proteins |
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| measure of the energy a wave carries |
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| Body parts that have a similar function, but not a similar structure |
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| Reproduction that involves only one parent organism |
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| Layer of the upper mantle that is made up of partially molten rock that can flow |
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| The smallest particle of an element that has all the properties of the element |
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| Mass equal to the number of protons plus the number of neutrons in the nucleus of an atom |
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Definition
| Number of protons in the nucleus of an atom |
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Definition
| molecule formed when a phosphate is removed from an ATP molecule |
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Definition
| Molecule that transfers the energy of chemical reactions within cells |
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Definition
| Overall change in an object's velocity during an certain time period divided by that time period |
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| Single long projection that extends from and carries messages away from the cell body of a neuron |
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| Way an organism responds to a stimulus |
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| Partical emitted from the nucleus of an atom during radioactive decay that has the same charge and mass as an electron |
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| Theory that the universe formed from a tiny piece of compacted matter that was acted upon by an explosion |
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Definition
| Type of asexual reproduction in which one parent splits in two to form two identical daughter cells |
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