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Approximately 30% of the animal and plant species that were alive during the cretaceous survived into the Tertiary. This includes some mammals, crocodilians, birds, snakes, insects and even tree frogs. The survival of tree frogs causes many to challenge the severity of the mass extinction. How could tree frogs survive if all the trees were destroyed by fire, acid rain and a shutdown of photosynthesis?

Most of the victims (70%) were large animals with food needs that caused their extinction. With all of the rotting flesh laying around, insects must have had a real ball. This would have helped omnivores who could eat bugs survive.

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How do you use tertiary in a a sentence?

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A meteorite impacted Earth, causing devastation of the planet and mass extinction.