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Ch 10 Living Things

organism any living thing
cell basic unit of structure and function for organisms
unicellular one celled organism
multicellular organisms composed of many cells
metabolism the combination of chemical reactions through which an organism builds up or breaks down materials
stimulus any change or signal from the environment that can make an organism react in some way
response an action or change in behavior that occurs as a result of a stimulus
development the process of change that occurs during an organism's life to produce a more complex organism (ie baby to adult)
asexual reproduction reproductive process involving only one parent; offspring are identical to the parent.
sexual reproduction a reproductive process that involves two parents; combines genetic material to produce a new organism that is different from either parent
spontaneous generation the mistaken idea that living things come from nonliving sources
autotroph an organisms that is able to produce it's own food
heterotroph an organism that cannot make its own food
homeostasis the condition in which an organism's internal environment is kept stable in spite of changes in its surroundings
classification grouping together similar organisms
taxonomy the scientific study of how living things are classified and named
binomial nomenclature two-part scientific naming system (classification)
genus a classification grouping that consists of closely related organisms; part 1 of binomial nomenclature
species a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce
prokaryote unicellular organism that lacks a nucleus
nucleus the part of a cell that contains DNA; the brain of the cell
eukaryote an organism whose cell contains a nucleus
evolution change over time; the process of a species passing down helpful adaptations
branching tree diagram a diagram that shows probable evolutionary relationships among organisms and the order in which specific characteristics my have evolved
shared derived characteristic a characteristic or trait that the common ancestor of a group had and passed on to its descendants
convergent evolution the process by which unrelated organisms evolve (develop over time) similar characteristics
Created by: Ms. Begley