Words to Describe archosaurs

How archosaurs often is described ("________ archosaurs")

• embryonic
• bipedal
• extinct
• primitive
• ancestral
• most
• many
• only
• mesozoic
• small
• advanced
• later
• endothermic
• earliest
• extant
• basal
• quadrupedal
• fossil
• carnivorous
• early
• other
• ancient