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24 06, 2017

Jurassic Period – dinosaurs and ferns

By |2018-04-21T11:56:46-07:00June 24th, 2017|Geology, When|0 Comments

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 [...]

24 06, 2017

What happened in the Cretaceous Period?

By |2019-04-29T06:34:15-07:00June 24th, 2017|Geology|0 Comments

Volcano erupting When was the Cretaceous period? During the Cretaceous period, beginning about 145 million years ago, the continents continued to drift away from each other. Plate tectonics Back to the Jurassic Summary of geological eras All our geology articles What happened during the Cretaceous? Because the continents were separated, mammals, birds, and [...]

23 06, 2017

History of turkeys – Where do turkeys come from?

By |2019-09-15T07:10:20-07:00June 23rd, 2017|Central America|4 Comments

History of turkeys: Wild turkeys When did turkeys evolve? Turkeys evolved from earlier birds. The ancestors of the turkey evolved about 100 million years ago, from the dinosaurs that were alive at that time. More about dinosaurs When did birds evolve? Native American environment All our Native articles Are turkeys related to chickens? [...]

29 05, 2017

Eggs – Evolution and Biology

By |2019-05-24T11:37:23-07:00May 29th, 2017|Biology|0 Comments

Fish eggs: Egg evolution starts with soft eggs like these When did the first eggs evolve? The earliest living creatures made babies by dividing themselves in half, so that one cell became two cells. But about 1.4 billion years ago, some creatures with more than one cell began to develop specialized cells. These [...]

27 05, 2017

How do animals breathe? Respiration, Evolution, Biology

By |2018-04-21T11:56:44-07:00May 27th, 2017|Biology|0 Comments

Fish gills The first cells, which evolved about 3.8 billion years ago, needed carbon dioxide to live and not oxygen. They needed the carbon dioxide to help them break down molecules to get energy out of them, and they were able to get the carbon dioxide they needed from the oceans they lived [...]

26 05, 2017

Mollusks and cephalopods – Biology

By |2019-09-16T05:37:52-07:00May 26th, 2017|Biology|4 Comments

Evolution of mollusks: Slugs are a kind of mollusk. When did the first mollusks appear? Mollusks are animals like mussels, clams, snails and slugs. Their name means "soft", because mollusks don't have any skeletons. The first mollusks probably evolved from early segmented worms around 500 million years ago.  That was in the Cambrian period. At [...]

26 05, 2017

What are reptiles? Biology and Evolution

By |2018-04-21T11:56:35-07:00May 26th, 2017|Biology|0 Comments

Boa Constrictor snake Some kinds of amphibians evolved into reptiles about 300 million years ago. At this time, plate tectonics had moved more and more of the land on Earth into one big continent called Pangaea. All the land being together changed the weather so that it was drier and colder than before. That [...]

25 05, 2017

History of Birds – Biology

By |2019-02-14T21:03:14-07:00May 25th, 2017|Biology|0 Comments

A robin sits on a branch: birds biology When did birds evolve? The first birds evolved out of earlier small dinosaurs late in the Jurassic period, about 150 million years ago. At this time, most of the bigger animals on Earth were dinosaurs. Really, dinosaurs? The Jurassic period All our biology articles How [...]