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Chapter 1 Lesson 1
What is life?
| Term | Definition |
|---|---|
| Organism | A living thing. |
| Cell | A basic building block of any living thing. |
| Unicellular | Made of a single cell |
| Multicellular | Consisting of many cells. |
| Metabolism | The combination of chemical reactions through which an organism builds up or breaks down materials. |
| Stimulus | Any change or signal in the environment that can make an organism react in some way. |
| Response | A reaction or change in behavior that occurs as a result of a stimulus. |
| Development | The process of change that occurs during an organism's life to produce a more complex organism. |
| Asexual reproduction | A reproductive process that only involves one parent and produces offspring that looks identical to the parent. |
| Sexual Reproduction | A reproductive process that involves two parents that combine their genetic material to create a new organism. |
| Spontaneous generation | The mistaken idea that living things arise from nonliving sources. |
| Controlled experiment | An experiment in which only one variable is manipulated at a time. |
| autotroph | An organism that is able to capture energy from the sunlight or chemicals and use it to produce its own food. |
| heterotroph | An organism that cannot make its own food and gets food by consuming other living things. |
| homeostasis | The condition in which an organism's internal environment is kept stable in spite of changes in the external environment. |