E.11

Question 1

Precambrian Era

Answer 1

Time: 4600 to 600
millions of yrs ago
Events: Formation of the Earth and cooling of the crust
Life: simple organisms (bacteria)

Question 2

Paleozoic Era

Answer 2

Time: 600 to 225 millions of yrs ago
Events: formation of Pangaea, explosion of new life, mass extinction
Life: first reptiles, land animals, fish, insects, and large land plants

Question 3

Mesozoic Era

Answer 3

Time: 225 to 65
millions of yrs ago
Events: extinction of the dinosaurs
Life: dinosaurs, first flowering plants, birds, and mammals

Question 4

Cenozoic Era

Answer 4

Time: 65 millions of yrs ago to present day
Events: changes in climate and moving of continents
Life: modern species, first grasses, first human-like species