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Many new groups of organisms evolved in a relatively short time in an event called the _____.

User Saprina
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Answer:

cambrian explosion

Step-by-step explanation:

User Arley
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The answer that completes the statement is CAMBRIAN EXPLOSION. The Cambrian explosion is also known as the Cambrian Radiation and occurred 541 million years ago. According to the records, this was the time that the major animal phyla has evolved and this included many new group of organisms. Hope this helps.
User BIOHAZARD
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