teeth i see you want the teeth section better explained the idea is that tetrapods that grows slowly i e reptiles continue to grow in maturity both the steadily increasing size of the jaws and the wear and tear imposed by a long life dictate continued change of teeth mammalian teeth being complex replacing teeth requires quite a bit of resources and as anyone having children of pre school age can attest to it is also a lot of bother try eating an apple without your front teeth thus for the fast living high energy demanding life of insectivorous mammals tooth replacement is kept to an minimum i e two setts a trait retained in their descendants how do you propose going about explaining it without making it a disproportionally large part of the article or is it so important it should be a large part