The image below shows a beam of radiation passing between two electrically charged plates. 
-Which of the beams is actually composed of particles?
Definitions:
Existing Theories
Previously developed and accepted explanations for phenomena or observations within a particular domain of knowledge.
Toilet Training
The process of teaching a young child to use the toilet for urination and defecation, also known as potty training.
Maturation
The process of becoming mature, involving the growth and development of the body or mind, or the development of natural abilities at a predetermined pace and sequence.
Object Permanence
The awareness that things continue to exist even when not perceived.
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