Earth/space during which periods did dinosaurs exist? select all that apply. a. triassic b. jurassic c. devonian d. cretaceous e. pennsylvanian

The answers are A). Triassic, B). Jurassic and E). Cretaceous

Explanation: Mesozoic era was the period when dinosaurs lived. It was million years ago before the Homo Sapiens start existing. The era was divided into 3; Triassic, Jurassic and Cretaceous.

The Triassic is the first and shortest period of the Mesozoic Era, It was in this environment that the reptiles known as dinosaurs first evolved.

The Jurassic constitutes the middle period of the Mesozoic Era, also known as the Age of Reptiles. Many large land animals were wiped out but the dinosaurs survived, giving them the opportunity to evolve into a wide variety of forms and increase in number.

The Cretaceous is the third and final period of the Mesozoic Era. It was during this period dinosaurs evolved independently in different parts of the world, becoming more diverse. Other groups of organisms also diversified. The first snakes evolved during this time, as well as the first flowering plants. Various insect groups appeared, including bees, which helped increase the spread of flowering plants.

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