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kicyunya [14]
3 years ago
15

The earliest ancestors of about half of all extant animal phyla can be traced back to the _____ explosion. see concept 32.2 (pag

e 675)
Biology
1 answer:
Vesna [10]3 years ago
4 0
The answer is 'Cambrian' explosion. This took place approximately 541 million years ago. 'Explosion' refers to the evolution of a large range of new major animal phyla. Scientists know this by the large number of diverse fossils from this period. Prior to this period, organisms were single-celled, but over the Cambrian Explosion, lasting about 80 million years, life forms diversified rapidly to resemble the life forms existing today.
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<em>Hope this helps!</em>

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