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homeostasis
process by which organisms maintain a relatively stable internal environment
metabolism
All of the chemical reactions that occur within an organism
response
a reaction to a stimulus
growth
increase in size
cells
The basic unit of structure and function in all living things
cell theory
idea that all living things are composed of cells
bacteria
single-celled organisms that lack a nucleus; prokaryotes
sexual reproduction
A reproductive process that involves two parents that combine their genetic material to produce a new organism
asexual reproduction
Process by which a single parent reproduces by itself
immune system
a complex response system that protects the body from bacteria