Triassic

... Era in the Devonian period (B) e Paleozoic Era in the Permian period (C) the Mesozoic Era in the Cretaceous period (D) the Mesozoic Era in the Triassic period 4. Which of the following statements do scientists believe to be true? (A) Like on earth began about 5000 years ago (B) 245 million ...

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... snails would have diverged from the other three close to the Cambrian period (~570 MYA, though likely before), and Dinosaurs arose in the Triassic (~250 MYA, sometime after) so fish would have to have diverged from the other chordates between 570 and 250 MYA... Pigs, being a modern mammal, ...

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... the start of the Cambrian due to grazing and burrowing organisms. Stromatolites also occurred after the Precambrian in the Phanerozoic and Lower Triassic as well as modern times, although usually very restricted by their environment. The reason for this may be due to a lack of grazing organisms ...

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... without any hard evidence as it seems to be the case with feather evolution and considering all fossil records of the earliest aves (oldest being triassic afaik) show fully evolved feathers (ie: same as today), it's not more arbitrary (although more far-fetched) to consider birds offsprings of ...

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... was closely related to the earliest ancestors of the dinosaurs. This would most likely put the common ancestor of chickens and horses in the early Triassic period.

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