Evolution of bones – Skeletons and Biology
A fish skeleton Before there were bones 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 [...]
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05, 2017
How did nerves and brains evolve? Biology and Evolution
The yellow string is one of the arm nerves of a cat By around two billion years ago, some eukaryote cells were able to sense changes in their surroundings and [...]
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05, 2017
How do eyes work? Evolution and 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 [...]
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05, 2017
What does a stomach do? – Digestion and Evolution
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, [...]
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05, 2017
Digestive System – Biology and Evolution
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 [...]
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05, 2017
Spiders and their Webs – 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 [...]
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05, 2017
Why do mosquitoes bite? 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 [...]
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05, 2017
What are arthropods? 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 [...]
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05, 2017
Why do bees make honey?
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 [...]
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05, 2017
Why do ants eat bugs?
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 [...]
