Examlex
Stars are born from the interstellar medium, and aging or dying stars return gas and dust back into the interstellar medium.
Psychological Research
The scientific study of individuals' behaviors, thoughts, and emotions through systematic observation, experimentation, and analysis.
Natural Selection
A process by which species adapt to their environment as individuals with beneficial traits survive and reproduce more successfully than others.
Behaviourism
A theory of learning based on the idea that all behaviors are acquired through conditioning, initiated by interactions with the environment.
John Watson
An American psychologist often cited as one of the founders of behaviorism, emphasizing the importance of observable behaviors over internal phenomena like thoughts and feelings.
Q8: When the Sun moves off the main
Q9: The Doppler effect is useful in measuring
Q20: How does gravity explain the presence of
Q35: Why is it so difficult to study
Q39: Pre-main sequence stars (not protostars) on the
Q43: Globular clusters are used as spiral tracers.
Q45: The diameter and luminosity of a galaxy
Q59: O stars must be formed in spiral
Q64: Define and distinguish among the terms speed,
Q68: Based on Shapley's determination of the center