Jurassic

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Where are the Andes Mountains? South America

By |2018-04-21T11:56:40+00:00June 25th, 2017|Geology, South America|

The Andes mountains run down the Pacific side of South America About 199 million years ago, near the beginning of the Jurassic period, was the time of the dinosaurs. That's when the supercontinent of Pangaea broke up and the pieces began to float away from each other. The supercontinent split up into the [...]

Jurassic Period – dinosaurs and ferns

By |2018-04-21T11:56:46+00:00June 24th, 2017|Geology, When|

A dinosaur skeleton When the Jurassic period began, about 199 million years ago, a lot of animals had just become extinct in the catastrophe that ended the Triassic period. This left room for the dinosaurs to have a lot of baby dinosaurs. Soon all different kinds of dinosaurs were living all over the [...]

What are ferns? Plant biology and evolution

By |2018-04-16T10:34:27+00:00May 29th, 2017|Biology|

Ferns growing in a forest The first ferns - the first plants that had leaves - evolved from plants that were more like moss. Ferns evolved about 360 million years ago, during the Carboniferous era. Like moss, most ferns grow in places where there is plenty of water: usually near the banks of streams. But [...]

What are cycads? Evolution and Biology

By |2018-04-16T10:33:47+00:00May 29th, 2017|Biology|

Cycad trees. They look like palm trees but they are very different! At the end of the Carboniferous period, about 300 million years ago, the only kinds of plants on Earth were mosses and ferns. Some of the ferns were giant ferns as big as trees are now. Then in the late Carboniferous [...]

What are dinosaurs? Evolution and Biology

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

Tyrannosaurus Rex dinosaur (American Museum of Natural History) The first dinosaurs evolved out of earlier types of chordate reptiles about 230 million years ago, on the big land mass called Pangaea. At that time, all of the land on earth was stuck together in one big continent. Like other reptiles, dinosaurs were generally cold-blooded [...]

How do Opossums carry their babies? Biology

By |2018-04-16T08:12:58+00:00May 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 [...]

Why do mosquitoes bite? Biology

By |2018-04-15T17:18:17+00:00May 25th, 2017|Biology|

Mosquitoes bite people: A mosquito on human skin Like bees, mosquitoes evolved from earlier flies and dragonflies about 200 million years ago, during the Jurassic period. Mosquitoes have six legs like other insects. Also like bees, mosquitoes evolved to eat pollen from the new flowers that appeared about this time. And like bees, mosquitoes [...]

What are arthropods? Biology

By |2018-04-15T17:01:39+00:00May 25th, 2017|Biology|

Bee on a flower Insects, spiders, crabs, and lobsters are all arthropods, so there are a lot of arthropods on Earth. The earliest arthropods on Earth developed about 550 million years ago. That was during the Proterozoic period. Arthropods' ancestors were a kind of worm that was divided into segments, probably distantly related to [...]

Why do grasshoppers jump? – Biology

By |2017-05-25T15:32:20+00:00May 25th, 2017|Biology|

Grasshopper sitting on a leaf When grasshoppers first evolved from earlier insects, about 300 million years ago, they lived in forests of huge ferns, and the main danger to grasshoppers came from frogs. Like frogs, grasshoppers evolved to be good jumpers.They ate mainly ferns. Grasshoppers jump by pushing with the big muscles in [...]