It is most likely that mammal-like reptiles reproduced by laying eggs, as primitive mammals alive today, like the platypus, lay eggs.
(It; is; most likely) (that mammal-like reptiles; reproduced; ) (that mammal-like reptiles reproduced by laying eggs, as primitive mammals alive today, like the platypus; lay; eggs)
It that mammal-like reptiles that mammal-like reptiles reproduced by laying eggs, as primitive mammals alive today, like the platypus
is reproduced lay
most likely
eggs