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Science deff. Ch.5 les.1-4

STUDY
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organism
living things
cell
basic unit of structure and function in an organism
unicellular
single-celled organism
metabolism
combination of chemical reactions through which an prganism builds or breaks down materials
stimulus
a change in the organism's surronding
response
an action or a change in behavior
development
is the process of change that occurs during an organisms life producing more complex organsms
asexual reproduction
involes only one parent cell and produces offspring that are indntical to the parent
sexual reproduction
involes 2 parent cells and combines their genetic material to produce a new organism that differs from both parents
spontaneous generation
mistaken idea that living things can arise from non-living sources
controlled experiment
a scientist carries out a series of tests that are identical in every respest except for one factor
autotrophs
organisms that make their own food
heterotrophs
organisms that cannot make their own food
homeostasis
the maintaince of stable unternal conditions
domain
is the broadcast levelof organization
taxonomic keys
useful tools that help determine the identify of organisms
prokaryote
a unicellular organism having cells lacking a nucli
nucleus
is a dense area in cell that contains nuclus acids
eukaryotes
organisms with cells that contain nucli
evolution
recall that the process of change over time
species
with similar evolutionary histories are classified more clossley together
branching tree diagram
shows probable evolutionary relationship among organisms and the order in which specific charateristics may have evolved
classification
grouping together items based on the similarities
taxonomy
scinentific study of how organisms are classified
binomial nomenclature
each organism was given a unique, two part sientific name
genus
is a classification grouping that contains similar closly related organisms
species
a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce