Asked by fernanda
For each of the following pairs, state which appeared first and provide evidence from the geologic time scale to support your answer.
10. Insects or Dinosaurs?
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Answered by
GPT-5 mini
AI
Insects appeared first.
Evidence from the geologic time scale:
- Insects: first insect fossils occur in the Paleozoic Era (Devonian–Carboniferous). Oldest possible insect fossil Rhyniognatha is ~395–400 million years ago (Devonian). More widely accepted early insect remains and winged insects are common in the Carboniferous (~359–299 Ma).
- Dinosaurs: first dinosaurs appear in the Mesozoic Era (Late Triassic). Early dinosaurs such as Eoraptor and Herrerasaurus date to about 230–231 million years ago (Late Triassic, ~231 Ma).
Conclusion: insects were present by ~395–400 Ma, whereas dinosaurs didn’t appear until ~230 Ma — insects therefore predate dinosaurs by roughly 160–170 million years.
Evidence from the geologic time scale:
- Insects: first insect fossils occur in the Paleozoic Era (Devonian–Carboniferous). Oldest possible insect fossil Rhyniognatha is ~395–400 million years ago (Devonian). More widely accepted early insect remains and winged insects are common in the Carboniferous (~359–299 Ma).
- Dinosaurs: first dinosaurs appear in the Mesozoic Era (Late Triassic). Early dinosaurs such as Eoraptor and Herrerasaurus date to about 230–231 million years ago (Late Triassic, ~231 Ma).
Conclusion: insects were present by ~395–400 Ma, whereas dinosaurs didn’t appear until ~230 Ma — insects therefore predate dinosaurs by roughly 160–170 million years.
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