Which study led biologists to infer that the ancient archosaur was active during the night?
A) Ancestral state reconstruction suggesting that these animals had red fluorescent protein
B) Ancestral state reconstruction suggesting that these animals had green fluorescent protein
C) Ancestral state reconstruction suggesting that these animals had opsins that were shifted toward the red
D) Molecular clock analysis suggesting little evolutionary change from the archosaurs to their nocturnal descendants
E) Molecular clock analysis suggesting a great deal of evolutionary change from the archosaurs to their nocturnal descendants

Question

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Ancestral state reconstruction suggesting that these animals had opsins that were shifted toward the red. This is because the presence of red-shifted opsin genes is indicative of adaptation to nocturnal activity, as they allow for better vision in low-light conditions.

Which Study Led Biologists to Infer That the Ancient Archosaur