The figure below shows the rotation curves of several nearby spiral galaxies.What does the shape of these curves tell us about the content of these galaxies?
Definitions:
Productive Vocabularies
The set of words a person can actively use in speech or writing, as opposed to words they can only recognize when heard or read.
Under-extension
A cognitive error typical in early child language development where a child inappropriately restricts the use of a word to only one object or situation.
Telegraphic Speech
A stage in language acquisition in children where speech is abrupt and consists mainly of content words, resembling the structure of telegraph messages.
Fast Mapping
The rapid mental assignment of meaning to a new word by a child, often after a single exposure to the word in a meaningful context.
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