<human>: Q: In which era, did the first phylum of multicellular organisms appear?
 A: The history of biodiversity during the Phanerozoic (the last 540 million years), starts with rapid growth during the Cambrian explosion—a period during which nearly every phylum of multicellular organisms first appeared.
 Does the answer correctly answer the question

OPTIONS:
- yes
- no
<bot>: yes