18 terms

What is Life?

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cell
Basic unit of structure and function in living things.
Unicellular
Made of a single cell.
Multicellular
Organisms composed of many cells.
Stimulus
A change in an organism's surroundings that causes the organism to react.
Response
An action or change in behavior that occurs as a result of a stimulus.
Growth
The process of becoming larger.
Development
The process of change that occurs during an organism's life to produce a more complex organism.
Reproduce
To produce offspring that are similar to the parents. There are two types.
Spontaneous Generation
The mistaken idea that living things come from nonliving things.
Francesco Redi
This scientist disproved spontaneous generation by showing that maggots do not spontaneously arise from decaying meat.
Autotroph
An organism that makes its own food with the sun's energy.
Heterotroph
An organism that cannot make its own food.
Homeostasis
Process by which organisms maintain a relatively stable internal environment.
Sexual Reproduction
Reproduction that requires two organisms or parents and produces offspring that are different from the parents.
Asexual Reproduction
Reproduction that involves only one parent and produces offspring that are identical to the parent.
Chemicals of Life
The chemicals contained in living things (Water, Carbohydrates, Proteins, Lipids and Nucleic Acids.)
Characteristics of Living Things
Made of cells, can reproduce, grow and develop, obtain and use energy, respond to the environment and contain complex chemicals.
Needs of Living Things
All living things must satisfy the basic needs for energy (food), water, living space and stable internal conditions (homeostasis)