What helped biologists to predict that nonavian dinosaurs probably incubated their eggs and cared for their young?

Question

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The distribution of parental care behavior on a cladogram of archosaurs helps biologists predict that nonavian dinosaurs likely incubated their eggs and cared for their young. This is because the cladogram, a diagram that shows relationships among organisms, indicates that such behaviors are present in closely related species, suggesting they were also present in their common ancestors, including nonavian dinosaurs.

What Helped Biologists to Predict That Nonavian Dinosaurs Probably Incubated