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In an experiment to test the __________? hypothesis for the origin of wings, researchers probed
the developing limbs of brine shrimp (a living member of an ancient lineage of crustaceans) for the
presence of tool-kit genes called nubbin and apterous.
a) gills to feathers (hypothesis).
b) gill co-option (hypothesis).
c) wings-from-thorax (hypothesis).
d) gill arch (hypothesis).
e) independent gill (hypothesis).

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