A) Earth was much colder then.
B) there was more oxygen in the air then.
C) there was more nitrogen in the air then.
D) they lacked predators then.
E) they were able to exploit an aquatic niche that no longer exists.
Tag Archive | "Larger"
The Primary Reason That Dragonflies Grew So Much Larger 300 Million Years Ago Than They Do Today Is That?
Posted on 16 February 2013.
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