The First Fully Land- Based Animals Were______

Q10: In Rodinia, a well- documented Precambrian supercontinent,

Q11: At the start of the Paleozoic, North

Q12: The Goldilocks scenario suggests that _.<br>A) we

Q13: Most _rocks are devoid of fossils; consequently

Q14: Following the reptilian extinctions at the close

Q16: During the Cambrian, Trilobites developed a flexible

Q17: The heaviest element produced by nuclear fusion

Q18: Earth formed approximately_ years ago.<br>A) 4,600,000,000<br>B) 33,200,000,000,000<br>C)

Q19: Examine the words and/or phrases below and

Q20: Sea level is constant over long periods