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According to the theory of evolution, birds' feathers evolved from. a. reptile scales b. gill slits. c. fish fins. d. gill arches.
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According to the theory of evolution, birds' feathers evolved from.

a. reptile scales
b. gill slits.
c. fish fins.
d. gill arches.

User Dominik Chudy
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According to the theory of evolution, birds' feathers evolved from "reptile scales"--specifically the scales of dinosaurs if one search far enough back in time, which seems counterintuitive because scales are so hard. 
User Abkothman
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