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Ecosystems

Organisms and their Environment

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