Multiple Choice
According to most scientists, when did the first hominids-- direct human forbears that were fully separated from the apes-- appear on Earth?
A) about a billion years ago
B) a few billion years ago
C) a few million years ago
D) a few thousand years ago
E) about 100 billion years ago
Correct Answer:
Verified
Correct Answer:
Verified
Q46: Except for such nuclear processes as nuclear
Q47: At Chernobyl, one of the harmful radioactive
Q48: A saber- toothed- tiger's bones contain 1/32
Q49: We cannot predict the precise decay time
Q50: Radioactive dating methods and other dating methods
Q52: <sup>234</sup><sup> </sup>Th beta- decays. The resulting nucleus
Q53: <sup>14</sup>C has a half- life of 6000
Q54: A bone is dug up and analyzed
Q55: The half- life of radium is<br>A) half
Q56: Suppose that Al the physicist observes a