In reconstructing a phylogeny of all living vertebrates, the presence of feathers is a(n) _____________ found only among birds, and thus is a _____________ of the birds.
In reconstructing a phylogeny of all living vertebrates, the presence of feathers is a(n) _____________ found only among birds, and thus is a _____________ of the birds.
发布时间：2025-09-09 06:26:38
