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Biology Chapter 1

30 cards·by megcottingham
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Biology
the study of life
Organization
degree of order ithin an organism's external and interaal parts and its interaction with the living world
cell
the smallest unit that can perform all lifes proceses
unicellular
organism made up of one cell
mulitcellular
organism made up of many cells
organs
structures that carry out specialized jobs within an organ system
Tissue
group of cells that have similar abilities that allow the organ to function
Organelles
tiny strcutures that carry out functions necessary for the cell to stay alive
stimulus
a physical or chemical change in the internal or external environment
Homeostasis
the maintenance of a stable level of internal conditions even when changes occur
metabolism
the sum of all the chemical reactions that take in and transform energy and materials from the environment
cell division
the formation of 2 new cells from an existing cell
development
the process by which an organism becomes a mature adult
reproduction
the act of producing new organisms like themselves
gene
structure that contains DNA for one trait
sexual reproduction
hereditary information recombines from two organisms of the same species
asexual reproduction
hereditary information is not combined and new organism is genetically the same
evolve
the ability to change over time
domains
main branches of biology
ecology
the branch of biology that studies organisms interacting with each other and the environment
ecosystems
communities of living species and their physical environment
natural selection
organisms that have favorable traits are better able to survive
adaptations
traits that improve an individual's ability to survive
scientific method
an organized approach to solving a problem
hypothesis
an educated guess as to why something happens
control group
provides a normal standard to compare results to
experimental group
identical to control group with one variable that is different
variable
the thing changed in an experiment
independent variable
the thing being changed in an experiment
dependent variable
the response of the change in an experiment