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Triassic period – pine trees and pterodactyls

By |2018-04-21T11:56:46-07:00June 25th, 2017|Biology, Geology|

A turtle in the desert During the Triassic period (about 248 to 199 million years ago), most of Earth's land continued to stick together in one big supercontinent, Pangaea. Because the middle of Pangaea was so far from the oceans, it was very dry there, like a desert. The whole world was generally [...]

Seeds – Plant reproduction – Biology

By |2018-04-13T17:51:52-07:00May 30th, 2017|Biology|

Evolution of seeds: Dandelion seeds What is a seed? A seed is the egg cell of a plant, with a hard wrapper around it so it can survive on its own. The earliest plants with seeds evolved from plants with spores during the late Devonian period, about 360 million years ago. The seeds [...]

What are turtles? Biology and Evolution

By |2018-04-21T11:56:44-07:00May 26th, 2017|Biology|

Evolution of turtles: Seychelles tortoise (Jardin des Plantes, Paris) Evolution of turtles The first turtles began to evolve from earlier reptiles about 225 million years ago, during the Triassic period. By about 210 million years ago, they looked pretty much like modern turtles. Turtles are one of the oldest kinds of reptiles that [...]

How do Opossums carry their babies? Biology

By |2018-04-16T08:12:58-07:00May 26th, 2017|Biology|

Opossum The earliest mammals, about 200 million years ago, hatched from eggs and then got milk from their mothers, like the duck-billed platypus. But soon after that, about 125 million years ago, these mammals evolved into mammals that were born alive, but helpless and tiny. These tiny babies then lived in a pouch [...]

What are Mammals – Biology

By |2018-04-21T11:56:43-07:00May 26th, 2017|Biology|

Rat from New Zealand About 200 million years ago, when all the land on Earth was stuck together in one big continent called Pangaea, some animals related to reptiles living on Pangaea gradually evolved into a new group called mammals (MAMM-elz). The mammals were different from the earlier reptiles in several ways. First, [...]