13 terms

Chapter 1, 7th grade

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organisms
things that have all the characteristics of life
cell
the smallest unit of life
unicellular
living things that are made of only one cell
multicellular
living things that are made of two or more cells
homeostasis
an organism's ability to maintain steady internal conditions when outside conditions change
binomial nomenclature
a naming system in which each organism is given a two-word scientific name
species
a group of organisms that have similar traits and are able to produce fertile offspring
genus
a group of similar species
dichotomous key
a series of descriptions arranged in pairs that lead the user to the identification of an unknown organism
cladogram
a branched diagram that shows the relationships among organisms, including common ancestors
light microscopes
use light and lenses to enlarge an image of an object
compound microscope
a light microscope that uses more than one lens to magnify an object
electron microscope
use a magnetic field to focus a beam of electrons through an object or onto an object's surface