Organisms and their Environment
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each of the black spaces below before clicking
on it to display the answer.
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| ecosystem | all the organisms that live in an area together with all the nonliving factors of the environment
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| ecology | the study of ecosystems
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| organism | only one of any particular species; examples - 1 lion, 1 tree
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| population | all the organisms of the same species at the same place and time; example: all the squirrels in Memorial Parkway
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| community | all the populations sharing the same environment
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| habitat | the place where an organism lives
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| niche | the special role an organism plays within its habitat
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| biotic | the living factors in an ecosystem
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| abiotic | the non-living factors in an ecosystem
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| photosynthesis | process producers use to make their own chemical energy from the sun
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| sun | the first step in any food chain
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| cell | the basic unit of all living things
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| multi-cellular | an organism composed of more than one cell
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| uni-cellular | an organism composed of only one cell
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| microscope | tool used for observing specimens too small to be seen with the naked eye
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| prokaryotic | a cell without membrane bound internal structures; e.g. - no nucleus
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| eukaryotic | a cell with membrane bound internal structures such as a nucleus
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| DNA | deoxyribonucleic acid; the genetic material in a cell; the brains of the cell
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| nucleus | the membrane bound organism in a cell that contains the DNA
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| heterotrophic | an organism that consumes other organisms to get the energy it needs to live
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| autotrophic | an organism that makes its own food, usually through photosynthesis
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| asexual reproduction | requires genetic material from only one parent
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| sexual reproduction | requires genetic material from two parents
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| bacteria | a prokaryotic domain; organisms in this domain are found everywhere
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| archaea | a prokaryotic domain; organisms in this domain live only in extreme environments
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| domain | the largest group in the classification system; there are three - archaea, bacteria and eukarya
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| animalia | a eukarya kingdom; animals are multi-cellular, reproduce sexually, have cell membranes and heterotrophic
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| kingdom | the second level in the classification hierarchy, there are six
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| taxonomic classification | the system for organizing all living things; domain, kingdom, phylum, class, order, family, genus, species
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| plantae | a eukarya kingdom; plants are multi-cellular, reproduce sexually, have cell walls and are autotrophic
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| protista | a eukarya kingdom; most protists are unicellular, reproduce asexually, have cell membranes. they can be either autotrophic or heterotrophic
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| fungi | a eukarya kingdom; fungi have cell walls, are heterotrophic, most reproduce asexually. they can be uni or multi-cellular
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| eukarya | a eukaryotic domain, includes the kingdoms of organisms that have a nucleus in their cells: plants, animals, protists and fungi
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