which statements about geologic time are true? check all that apply. scientists developed the geologic time…

which statements about geologic time are true? check all that apply. scientists developed the geologic time scale as they studied rock layers and index fossils. the fossil record helps scientists describe life only in the seas and other bodies of water. precambrian time is the most recent time in earth’s history. precambrian time makes up 88 percent of earth’s history. the first birds appeared during the mesozoic era. the basic units of the geologic time scale are periods, eras, and centuries. humans appeared during the cenozoic era.

which statements about geologic time are true? check all that apply. scientists developed the geologic time scale as they studied rock layers and index fossils. the fossil record helps scientists describe life only in the seas and other bodies of water. precambrian time is the most recent time in earth’s history. precambrian time makes up 88 percent of earth’s history. the first birds appeared during the mesozoic era. the basic units of the geologic time scale are periods, eras, and centuries. humans appeared during the cenozoic era.

Answer

Brief Explanations:

  1. Scientists study rock - layers and index fossils to develop the geologic time scale, which is a well - known fact.
  2. The fossil record helps describe life on land and in water, not just in seas and bodies of water.
  3. Precambrian time is the earliest time in Earth's history, not the most recent.
  4. Precambrian time makes up about 88 percent of Earth's history.
  5. The first birds appeared during the Mesozoic Era.
  6. The basic units of the geologic time scale are eons, eras, periods, epochs, not centuries.
  7. Humans appeared during the Cenozoic era.

Answer:

  • Scientists developed the geologic time scale as they studied rock layers and index fossils.
  • Precambrian time makes up 88 percent of Earth's history.
  • The first birds appeared during the Mesozoic Era.
  • Humans appeared during the Cenozoic era.