The genetic variation in any species is confined to a limited set of variables such as a finch beak’s thickness.
A key question is how long biologists can argue that life looks like a duck, swims like a duck, and quacks like a duck, but it is actually a cat.
Neo-Darwinians breathed a sigh of relief when in the 1930s they found a way to incorporate Mendel’s laws of heredity. Now, that relief is unraveling.
Darwin gets credit by default for changes in organisms that should be seen instead as engineered products of foresight.
A giraffe grows from a zygote to an 18-foot-tall adult while keeping its organs and systems coordinated. Limits to variation is a significant point to clarify.