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Biology, 18.12.2019 02:31 haleylecompte
What's the primary reason that mammals and avian dinosaurs thrived in the paleogene period? a. plants developed as the main food source for these heterotrophic organisms. b. their predators had been killed off by the permian extinction. c. their predators had been killed off by the cretaceous-paleogene extinction. d. the earth significantly warmed, and cold-blooded animals couldn't survive.
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