Question | Answer |
Organ | A collection of tissues that carry out a specialized function of the body |
Tissue | Groups of cells that have similar abilities and that allow the organ to function |
Organelle | Tiny structures that carry out functions necessary for the cell to stay alive |
Homeostasis | The maintenance of a stable level of internal conditions even though environmental conditions are constantly changing |
Metabolism | The sum of all the chemical reactions that in and transform energy and materials from the environment |
Gene | A short segment of DNA that contains the instructions for a single trait |
Adaptation | The process of becoming adapted to an environment |
Evolution | The heritable change in the characteristics within a population from one generation to the next |
Natural Selection | Organisms that have certain favorable traits are better able to survive and reproduce successfully than organisms that lack these traits |
Hypothesis | An idea or explanation that is based on observations and that can be tested |
Experiment | A procedure that is carried out under controlled conditions to discover, demonstrate, or test a fact, theory, or general truth |
Control Group | In an experiment, a group that serves as a standard of comparison with another group to which the control group is identical except for one factor |
Experimental Group | In an experiment, a group that is identical to a control group except for one factor and that is compared with the control group |
Independent Variable | In an experiment, the factor that is deliberately manipulated |
Dependent Variable | In an experiment, the factor that changes as a result of manipulation of one or more other factors |
Theory | An explanation for some phenomenon that is based on observation, experimentation, and reasoning |
Metric System | A decimal-based standard system of measurement that is used by scientists |
Base Unit | One of the fundamental units of measurement that describes length, mass, time and other quantities and from which other units are derived |
Domain | 3 major subdivisions of life |
Kingdom | Groups of organisms that divides all life into six main categories |