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
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05, 2017
Why do we have fingers? Skeletons, Evolution, and Biology
Human hand bones The first fingers and toes evolved from earlier fish fins about 400 million years ago. During the Devonian period, the oceans were very shallow, and some fish [...]
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05, 2017
Vertebrae project – Boiling fish and chicken – Biology
Vertebrae project: check out fish and chicken vertebrae You can easily see vertebrae for yourself if you buy a whole trout (with the bones in) at the grocery store and [...]
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05, 2017
Fish bone project – Evolution and Biology
A fish skeleton To check out fish bones, buy a whole fish from a big grocery store with a fish department. You can get them with the head and tail [...]
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05, 2017
How do animals breathe? Respiration, Evolution, Biology
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 [...]
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05, 2017
Lungs project – Using your lungs to float – Biology and Evolution
Caribbean woman swimming with two children: lungs project Your lungs as swim bladders Your own lungs still can act a little like swim bladders. Here's a lungs project: When you [...]
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05, 2017
Reproductive System – Evolution and Biology
Reproduction: Hydra budding new hydras RNA and DNA molecules The first form of reproduction began about four billion years ago, when first RNA molecules and then DNA molecules began to make [...]
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05, 2017
Fish eggs and chicken eggs – Eggs science project
Fish eggs - eggs science project Different types of eggs This is a simple eggs science project. Check out different kinds of eggs and you'll see the difference between fish [...]
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05, 2017
Why do eyes have pupils?
Cats have pupils that can get bigger or smaller. Eyes start to focus light By around 550 million years ago, some kinds of worms evolved eyespots sunk into their heads to protect [...]
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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 [...]
