I only recently realized that evolution works, for the most part, by changing the processes of embryonic development. There are some exceptions—things like neoteny and metamorphosis—but most changes are genetic differences leading to differences in, say, how long a process of growth is allowed to occur in the embryo.
I only recently realized that evolution works, for the most part, by changing the processes of embryonic development. There are some exceptions—things like neoteny and metamorphosis—but most changes are genetic differences leading to differences in, say, how long a process of growth is allowed to occur in the embryo.