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Evolution of bones – Skeletons and Biology

By |2017-05-28T00:44:16-07:00May 28th, 2017|Biology|

A fish skeleton One-celled animals don't have any support system that holds them in a certain shape. Plants do have a support system, but it's the cellulose in the cell wall of each cell, rather than bones. Early multi-celled animals like jellyfish and sponges and worms also didn't have skeletons, but beginning with [...]

How do eyes work? Evolution and Biology

By |2019-06-03T16:05:12-07:00May 27th, 2017|Biology|

A flatworm with eye-spots Eyespots came first Living creatures have been able to tell if it's light out or not  for about two billion years. That's when some eukaryote cells evolved to be able to sense changes in their surroundings and react to them. More about eyespots The Proterozoic Eukaryote flagella All our biology articles For [...]

What does a stomach do? – Digestion and Evolution

By |2017-05-26T19:21:38-07:00May 26th, 2017|Biology|

Fish Stomach The first multi-cellular animals like hydras had no stomachs, or you could say they were all stomach, because they were shaped like a bag. Roundworms, a little later, were shaped like a tube, and the cells along that tube made mucus to protect the tube from the bacteria that digested food [...]

Digestive System – Biology and Evolution

By |2019-05-07T20:07:23-07:00May 26th, 2017|Biology|

Digestive system: A hydra eating: the mouth is where all the tentacles come together,near the center of the picture.The hydra is eating the round bug in its stomach. Before digestive systems... Starting about 3.8 billion years ago, during the Archaean Era, one-celled creatures were the earliest living things. They just floated in the ocean [...]

Spiders and their Webs – Biology

By |2017-09-16T18:40:57-07:00May 25th, 2017|Biology|

Fossil spider from the Cretaceous era Spiders evolved from annelid worms beginning about 540 million years ago. They were among the first land creatures with more than one cell. At about the same time, the first bigger land animals began to come out of the water: frogs and salamanders. These ate spiders. The earliest evidence of an orb [...]

Why do mosquitoes bite? Biology

By |2018-04-15T17:18:17-07:00May 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 |2019-02-03T21:35:07-07:00May 25th, 2017|Biology|

Bee on a flower What are arthropods? Insects, spiders, crabs, and lobsters are all arthropods, so there are a lot of arthropods on Earth. Annelid worms All our biology articles When were the first arthropods? The earliest arthropods on Earth developed about 550 million years ago. That was during the Proterozoic period. Proterozoic [...]

Why do bees make honey?

By |2019-01-28T06:35:10-07:00May 25th, 2017|Biology|

Bees evolve from flies The history of bees: Bees evolved from earlier flies and dragonflies about 200 million years ago, during the Jurassic period. More about flies The Jurassic period All our biology articles This was when the dinosaurs were alive. Bees developed the ability to take advantage of a new food source: flowering plants like [...]

Why do ants eat bugs?

By |2019-01-28T06:42:41-07:00May 25th, 2017|Biology|

Evolution of ants: A bunch of ants When did ants evolve? Ants evolved from earlier wasps about 150 million years ago, during the Cretaceous period. The evolution of ants was around the same time that mammals were beginning to become common, soon after the dinosaurs died out. Go back to bees and wasps More [...]