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The Diversity of Life Ch 1
Interactive Science Series
27
Science
7th Grade
02/03/2017

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Term
organisms
Definition
living things
Term
cell
Definition
basic unit of structure and function in an organism
Term
unicellular
Definition
single-celled organisms
Term
multicellular
Definition
organisms composed of many cells
Term
metabolism
Definition
the combination of chemical reactions through which an organism builds up or breaks down materials
Term
stimulus
Definition
a change in an organisms surroundings that causes the organism to react
Term
response
Definition
an action or change in behavior
Term
development
Definition
the process of change that occurs during an organism's life, producing a more complex organism
Term
asexual reproduction
Definition
involves only 1 parent and produces offspring that are identical to the parent
Term
sexual reproduction
Definition
involves two parents and combines their genetic material to produce a new organism that differs from both parents.
Term
spontaneous generation
Definition
the mistaken idea that living things can arise from nonliving sources
Term
controlled experiment
Definition
a series of tests that are identical in every respect except for one factor
Term
autotrophs
Definition
self-feeder
Term
heterotrophs
Definition
organisms that cannot make their own food
Term
homeostasis
Definition
the maintenance of stable internal conditions
Term
classification
Definition
the process of grouping things based on their similarities
Term
taxonomy
Definition
the scientific study of how organisms are classified
Term
binomial nomenclature
Definition
the systems for giving organisms a unique, two-part scientific name
Term
genus
Definition
a classification grouping that contains similar, closely related organisms
Term
species
Definition
a group of similar organisms that can mate with each other and produce
Term
prokaryotes
Definition
unicellular organisms whose cells lack a nucleus
Term
nucleus
Definition
a dense area in a cell that contains nucleic acids
Term
eukaryotes
Definition
organisms with cells that contain nuclei
Term
evolution
Definition
the process of change over time
Term
branching tree diagram
Definition
shows probable evolutionary relationships among organisms, and the order in which specific characteristics may have evolved
Term
shared derived characteristics
Definition
a trait that the common ancestor of a group had, and passed on, to its descendants
Term
convergent evolution
Definition
the process by which unrelated organisms evolve similar characteristics that are similar.
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