Science study guide
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The cambrian explosion was the-
appearance of many different life forms on Earth
_______ might have affected mammal evolution in Australia
land bridges
Glacial grooves are evidence of
ice scraping on land
The geologic time scale was developed using
changes in fossils
________ was NOT a significant geologic event of the mesozoic era
widespread glaciation
The cenozoic era is called the age of mammals because-
they were successful during this era
Coal beds of the paleozoic era formed in ______ climates -
wet, warm, tropical
The dominant life-forms of the mesozoic era were-
reptiles
________ covered much of earth during the early paleozoic era -
inland seas
The pleistocene ice age was a major event of the _____ era-
Cenozoic
_______ occur when numerous species die out
mass extinction
A _____ does NOT cause geographic isolation -
small stream