Context: The first amniotes apparently arose in the Late Carboniferous. They descended from earlier reptiliomorph amphibious tetrapods, which lived on land that was already inhabited by insects and other invertebrates as well as by ferns, mosses and other plants. Within a few million years, two important amniote lineages became distinct: the synapsids, which would later include the common ancestor of the mammals; and the sauropsids, which would eventually come to include turtles, lizards, snakes, crocodilians, dinosaurs and birds. Synapsids have a single hole (temporal fenestra) low on each side of the skull.

Question: From which period did the first known amniotes arise from?
Answer: Carboniferous

Question: From which group did amniotes descendents of?
Answer: reptiliomorph amphibious tetrapods

Question: Two important Amniotes  lineages became distinct, what was the name of that distinction?
Answer: the synapsids

Question: Sauropsids would later include which other animals into its group?
Answer: turtles, lizards, snakes, crocodilians, dinosaurs and birds

Question: What is a distinct trait of Synapsids?
Answer: single hole (temporal fenestra) low on each side of the skull

Question: From what period did the first insects come from?
Answer: Unanswerable

Question: What already inhabited the synapsids?
Answer: Unanswerable

Question: When did amphibious tetrapods become prominent?
Answer: Unanswerable

Question: What do amniotes have on each side of the skull?
Answer: Unanswerable

Question: What animals were later included in the carboniferous group?
Answer: Unanswerable