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What era did animals with a backbone first appear?

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  • What era did animals with a backbone first appear?


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What era did animals with a backbone first appear? ... in what era did most types of animals first appear? Hadean Paleozoic Mesozoic Cenozoic. weegy; ...
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Positive: 31 %
The first fossils that might represent animals appear in the ... diverged first, representing the oldest animal ... (animals with a backbone) ...
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Positive: 28 %

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The first 3-D reconstruction of a four-legged animal backbone reveals that the first animals on land moved like seals. ... First Land Animals Shuffled Like ...
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Positive: 31 %
A new study mapping the evolutionary history of animals indicates that Earth's first ... significantly more complex than previously ... than did the ...
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Positive: 26 %
... the first, fragmentary forms ... The Story of Snake Evolution. ... Tetrapodophis Was it really a snake, and did it really have four legs?
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Positive: 12 %
Origins of Trilobites The question "Where did trilobites ... and traces of animals, ... that arthropods did not miraculously appear in the ...
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Positive: 10 %

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