Which of the following appeared during the Mesozoic Era?a.Birdsc.Mammalsb.Dinosaursd.All of the above
The division of Earth’s history into smaller units makes up the ____.a.erasc.periodsb.geologic time scaled.sequence of events
The mass extinction at the end of the Mesozoic Era was caused by ______.a.solar radiationc.an ice ageb.a meteor or asteroid colliding with Earthd.volcanic activity
Early land animals had to return to the water to reproduce.
Please select the word from the list that best fits the definition
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