The ________ Era Spans About 88 Percent of Earth's History

Q5: Planets in the making are referred to

Q24: The major source of free oxygen in

Q27: One group of reptiles,exemplified by the fossil

Q36: The waste gas released by plants as

Q43: On each continent,large "core areas" of Precambrian

Q56: During the early Paleozoic era,South America,Africa,Australia,Antarctica,India,and perhaps

Q60: The _ period was the "golden age

Q64: The Cenozoic era is often called the

Q76: By the close of the Paleozoic,all the

Q99: The supercontinent of Pangaea formed during the