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Match the words found inside the text with their correct meanings:
( ) protolanguage
( ) development
( ) remains
( ) gene
I. the reconstructed or postulated parent form of a language or a group of related languages.
II. any pieces, scraps, fragments, etc. that are left unused or still extant, as after use, consumption, the passage of time.
III. the act or process of growth; progress:
IV. the basic physical unit of heredity.