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18 terms

What is Life?

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Organism
A living thing
Cell
Basic unit of structure in an organism
Unicellular
Made of a single cell
Multicellular
An organism composed of many cells
Stimulus
A change in surroundings that causes an organism to react
Response
An organism's reaction to a stimulus. An action or change in an organisms behavior.
Development
The process of change that occurs during an organism's life to produce a more complex organism
Life Cycle
All of the changes an organism undergoes during its lifetime
Life Span
The amount of time an organism can expect to live
Spontaneous generation
The mistaken idea that living organisms arise from non-living sources
Controlled Experiment
Conducted by performing 2 tests that are identical except for one factor (variable)
Autotroph
An organism that makes its own food
Heterotroph
An organism that gets energy by consuming other organisms
Homeostasis
An organism's ability to maintain stable internal conditions
Warm-blooded
Having a body temperature that stays the same
Cold-blooded
Having a body temperature that changes along with the temperature of surroundings
Metamorphosis
A process in which an animal's body changes in form
The 6 characteristics of living things
made of cells, grow and develop, use energy, respond to changes in the environment, can reproduce, are made of similar chemicals