The First True Terrestrial Animals Were the ________

Q1: Many reptile groups became extinct at the

Q19: As the solar system began forming,the first

Q27: One group of reptiles,exemplified by the fossil

Q28: Well preserved remains of many tiny organisms

Q39: During the early Paleozoic era,the continent of

Q40: Primitive organisms,called _,reproduce asexually and contain cells

Q71: Which one of the following does NOT

Q73: The cells of these primitive organisms lack

Q75: What were the three gases that made

Q79: Which of the following gases was NOT