Check all of the following statements that are true regarding mammalian ancestry.
a. Earliest mammals share a common ancestry with the lizard-like pelycosaurs.
b. This similarity to the lizards reflects a close common ancestry of synapsids and lizards. The cynodonts are an important group of ancient therapsids that displayed characteristics like heterodont teeth, turbinate bones, secondary palate, and a diaphragm. These characteristics were important precursors to the mammalian condition.
c. Early mammals acquired a diphyodont tooth condition, one that persists in all mammals today
d. Mammals of the Triassic period were virtually all placentals, Live birth evolved very early in mammalian history