A Theory

question 278

Multiple Choice

A theory:

• A)is another term for a hypothesis.
• B)integrates and summarizes diverse findings on the same topic.
• C)is based strictly on speculation rather than any kind of empirical evidence.
• D)is a statement of absolute fact that eventually becomes a scientific law.

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Definitions:

Positron-Emission Tomography

A diagnostic imaging test that uses a radiotracer to visualize and measure changes in metabolic processes and in other physiological activities including blood flow, regional chemical composition, and absorption.

Radio Waves

Electromagnetic waves with the longest wavelengths in the electromagnetic spectrum, used in communication systems to transmit data over long distances.

Magnetic Fields

A vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

Pineal Gland

A small, pea-shaped gland in the brain that produces melatonin, a hormone that regulates sleep-wake cycles.