Adults Rarely Achieve Full Fluency of a Second Language Unless

question 41

True/False

Adults rarely achieve full fluency of a second language unless it is acquired as a child.

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Definitions:

Vaccines

Biological preparations that provide active acquired immunity to a particular infectious disease.

Koch's Postulates

A set of four criteria designed to establish a causative relationship between a microbe and a disease.

Pathogen

An organism, usually a microorganism, capable of producing disease.

Disease Symptoms

Observable effects experienced by an individual resulting from a disease, which can include fever, fatigue, pain, and other physical and psychological changes.