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Holt Biology
Chapter 19 Vocabulary
12
Biology
9th Grade
03/02/2012

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Term
colonial organism
Definition
a collection of genetically identical cells that are permanently associated but in which little or no integration of cell activities occurs
Term
aggregation
Definition
a temporary collection of cells that come together for a period of time and then separate
Term
multicellular
Definition
describes a tissue, organ, or organism that is made of many cells
Term
differentiation
Definition
the process in which the structure and function of the parts of an organism change to enable specialization of those parts
Term
tissue
Definition
a group of similar cells that perform a common function
Term
organ
Definition
a collection of tissues that carry out a specialized function of the body
Term
organ system
Definition
a group of organs that work together to perform body functions
Term
protist
Definition
an organism that belongs to the kingdom Protista
Term
hypha
Definition
a nonreproductive filament of a fungus
Term
vascular tissue
Definition
the specialized conducting tissue that is found in higher plants and that is made up mostly of xylem and phloem
Term
invertebrate
Definition
an animal that does not have a backbone
Term
vertebrate
Definition
an animal that has a backbone; includes mammals, birds, reptiles, amphibians, and fish
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