Which statements describe how the geologic timescale is organized? Select all that apply.
by intervals of time equal in length over Earth's 4.6 billion year history
by major changes in ancient Earth's climate or major natural disasters
by the appearance, disappearance, or change in dominance (frequency) of particular fossil groups
by the date that fossils were discovered by paleontologists
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Ответ:
phylum Porifera
Explanation:
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