1. 1. Biology
Google.com
Dictionary.com
The study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behavior, origin, and distribution.
The science of life or living matter in all its forms and phenomena, especially with reference to origin, growth, reproduction, structure, and behavior.

2. 2. Cell The smallest structural and functional unit of an organism
Google.com
Dictionary.com
The smallest structural and functional unit of an organism
A usually microscopic structure containing nuclear and cytoplasmic material enclosed by a semipermeable membrane and, in plants, a cell wall; the basic structural unit of all organisms.

3. 3. Homeostasis
Google.com
Dictionary.com
The tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
The maintenance of metabolic equilibrium within an animal by a tendency to compensate for disrupting changes

4. 4. Sexual Reproduction
Google.com
Dictionary.com
The production of new living organisms by combining genetic information from two individuals of different types (sexes).
Reproduction involving the union of gametes

5. 5. Asexual Reproduction
Google.com
Dictionary.com
Reproduction, as budding, fission, or spore formation, not involving the union of gametes.
Reproduction occurring without the sexual union of male and female gametes.

6. 6. Metabolism
Google.com
Dictionary.com
The chemical processes that occur within a living organism in order to maintain life.
The sum of the physical and chemical processes in an organism by which its material substance is produced, maintained, and destroyed, and by which energy is made available.

7. 7. Stimulus
Google.com
Dictionary.com
A thing or event that evokes a specific functional reaction in an organ or tissue
Something that incites to action or exertion or quickens action, feeling, thought, etc.

8. 8. Science
Google.com
Dictionary.com
The intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
Systematic knowledge of the physical or material world gained through observation and experimentation.

9. 9. Observation
Google.com
Dictionary.com
The action or process of observing something or someone carefully or in order to gain information.
An act or instance of viewing or noting a fact or occurrence for some scientific or other special purpose:

10. 10. Data
Google.com
Dictionary.com
Facts and statistics collected together for reference or analysis
Individual facts, statistics, or items of information

11. 11. Inference
Google.com
Dictionary.com
A conclusion reached on the basis of evidence and reasoning.
The process of deriving the strict logical consequences of assumed premises.

12. 12. Hypothesis
Google.com
Dictionary.com
A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation
A proposition, or set of propositions, set forth as an explanation for the occurrence of some specified group of phenomena

13. 13. Spontaneous Generation
Google.com
Dictionary.com
The supposed production of living organisms from nonliving matter, as inferred from the apparent appearance of life in some supposedly sterile environments.
The now discredited theory that living organisms can arise spontaneously from inanimate matter

14. 14. Controlled Variable
Google.com
Dictionary.com
In an experiment, the control variable is something that is constant and unchanged
A person, group, event, etc., that is used as a constant and unchanging standard of comparison in scientific experimentation.

15. 15. Manipulated Variable
Google.com
Dictionary.com
These are variables that you change on purpose in your experiment. It is what you are testing
A variable that is intentionally changed to observe its effect on the dependent variable.

16. 16. Responding Variable
Google.com
Dictionary.com
These are the changes that happen in your experiment because of what you changed.
The variable measured by the experimenter. It is controlled by the value of the independent variable

17. 17. Theory
Google.com
Dictionary.com
A well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method and repeatedly tested and confirmed through observation and experimentation.
A coherent group of propositions formulated to explain a group of facts or phenomena in the natural world and repeatedly confirmed through experiment or observation