1) The division of Earth’s history based on life forms which lived during that period. a) Seafloor spreading b) Geologic Time Scale c) Prehistoric dinosaurs 2) Are the longest subdivision of GTS. a) Eons b) Eras c) Periods 3) Is a change of animals over time. a) Natural selection b) Periodic table  c) Organic evolution 4) Is a group of organisms which have the ability to reproduce with members of their group. a) Period b) Epoch c) Species 5) The theory that organisms with characteristics best suited for that environment will survive there is known as _______________. a) Natural selection b) Organic evolution c) Solar system 6) What is the longest part of Earth’s history. Trace fossils appeared. a) Precambrian Time b) Mesozoic Era c) Paleozoic Era d) Cenozoic Era 7) Approximately how old is the earth? a) 5 BYA b) 4.6 MYA c) 4.6 BYA d) 3.5 MYA 8) The Cenozoic era is called the age of mammals because a) mammals first evolved at this time. b) fish were very successful during this time. c) many dinosaurs became extinct during this time. 9) The geologic time scale was developed using a) climate data. b) glacial grooves. c) . changes in fossils. d) meteorite fragments. 10) List the 4 time periods (eras) beginning with the most recent one. a) Precambrian Time, Mesozoic, Cenozoic, Paleozoic b) Paleozoic, Mesozoic, Precambrian, Cenozoic c) Precambrian Time, Paleozoic, Mesozoic, Cenozoic d) Cenozoic, Mesozoic, Paleozoic, Precambrian Time

GEOLOGIC TIME SCALE

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