The palaeozoic started in a period in which invertebrates started proliferating rapidly and in large amounts, which was considered a historical event and the end of that gigantic era.
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The sentences that make sense are "Volatile liquids are flammable" and "Liquids burn easily."
The quality of hr claim is not only weak because of she uses an unreliable source, but it could also makes her look bias because she does not acknowledge the other side which makes her claim not thorough enough to be valid.
