6 Questions
What is the approximate duration of the Paleozoic Era in million years?
541-251mya
Which period is characterized by the sudden diversification of metazoan?
Ordovician Period
What percentage of all marine species became extinct during the Permian Period?
96%
What is the name of the first vertebrate to appear in the fossil record?
Agnathans
In which period did the first bird appear?
Jurassic Period
What is the approximate duration of the Mesozoic Era in million years?
65-248mya
Learn about the early stages of life on Earth, from the Cambrian explosion to the Ordovician Period. Discover the evolution of invertebrates, fish, and vertebrates during this pivotal time in Earth's history.
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