Question

The fossil record contains many intermediate forms of at least one evolutionary line of animals. Beginning with a set of ancient fossils of extinct animals that had three toes, the fossil record continues with intermediate forms containing two toes, and then to a single toe. What concept does this finding support?

reproductive isolation
gradualism
speciation
punctuated equilibrium

Is it gradualism?
Ms. Sue
I agree.
Anonymous
Thank you!
Ms. Sue
You're welcome.