Which statements about geologic time are true? Check all that apply.
1 Scientists developed the geologic time scale as they studied rock layers and index fossils.
2 The fossil record helps scientists describe life only in the seas and other bodies of water.
3 Precambrian time is the most recent time in Earth’s history.
4 Precambrian time makes up 88 percent of Earth’s history.
5 The first birds appeared during the Jurassic period.
6 The basic units of the geologic time scale are periods, eras, and centuries.
7 Humans appeared during the Cenozoic era.
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