Question

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Explanation:

For question 7: Geologic time intervals are ordered by length from longest to shortest: Precambrian (covers ~88% of Earth's history), Paleozoic, Mesozoic, Cenozoic (the shortest). Only option 4 reflects this relative scale.
For question 8:

• Option a: Ordovician (Paleozoic, ~45.3 myr), Triassic (Mesozoic, ~50.6 myr), Tertiary (Cenozoic, ~63 myr) shows increasing length.
• Option b: Jurassic (~56 myr), Cretaceous (~79 myr), Tertiary (~63 myr) does not increase.
• Option c: Triassic (~50.6 myr), Devonian (~57 myr), Cambrian (~53 myr) does not increase.
• Option d: Carboniferous (~60 myr), Devonian (~57 myr), Cretaceous (~79 myr) does not increase.

Answer:

1. 4
2. a. Ordovician, Triassic, Tertiary