What occurred during the Cretaceous period of animal evolution?(a) Dinosaurs evolved(b) Extinction of dinosaurs(c) Evolution of primitive birds(d) Modern birds disappearedI got this question in my homework.My question is from A Brief Account of Evolution of Animals topic in section Evolution of Biology – Class 12

What occurred during the Cretaceous period of animal evolution?(a) Din

1.	What occurred during the Cretaceous period of animal evolution?(a) Dinosaurs evolved(b) Extinction of dinosaurs(c) Evolution of primitive birds(d) Modern birds disappearedI got this question in my homework.My question is from A Brief Account of Evolution of Animals topic in section Evolution of Biology – Class 12
Answer» Correct CHOICE is (b) EXTINCTION of dinosaurs Explanation: Extinction of dinosaurs and primitive birds OCCURRED. First modern birds appeared during the Cretaceous period. ALSO, primitive placental mammals like insectivorous shrews also ORIGINATED. This all occurred 7.1 crore years ago.

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