flatworms

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24 06, 2017

Proterozoic Eon – eukaryotes to worms

By |2018-04-21T11:56:39-07:00June 24th, 2017|Biology, Geology|0 Comments

Two and a half billion years ago, the Archaean Eon ended and the Proterozoic Eon began. Trillions of prokaryote cells lived in Earth's oceans. Some of these cells could photosynthesize their energy from sunlight, water, and carbon dioxide. These photosynthesizing cells pooped out a lot of oxygen. By about 2.3 billion years ago, the iron [...]

27 05, 2017

What are neurons? Nervous system evolution and biology

By |2017-05-27T15:24:43-07:00May 27th, 2017|Biology|0 Comments

A network of neurons One-celled creatures like bacteria don't have neurons, because they can communicate within themselves through the use of enzymes, but all multicellular animals do have neurons. The simplest and earliest example of neurons is in hydras, which evolved around 600 million years ago. In hydras, neurons are not organized into [...]

27 05, 2017

How do eyes work? Evolution and Biology

By |2019-06-03T16:05:12-07:00May 27th, 2017|Biology|0 Comments

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 [...]

26 05, 2017

What is a brain? Biology and Evolution

By |2019-02-21T21:22:18-07:00May 26th, 2017|Biology|0 Comments

This is a mouse brain When did the first brains evolve? Flatworms were the first animals to evolve anything like a brain, but it's really just a thickened part of the main nerve at one end of the flatworm. That was about 550 million years ago, in the Proterozoic period. What is a [...]

26 05, 2017

What is a muscle? Biology and Evolution

By |2017-05-26T23:42:02-07:00May 26th, 2017|Biology|0 Comments

A black woman shows off her muscles One-celled creatures don't have any muscles; the ones that can move themselves use flagellae instead. Even after living creatures evolved that had a lot of cells, the early ones like hydras and sponges couldn't move. The earliest creatures that had muscles and could move on their own [...]

26 05, 2017

What is a flatworm? Evolution and Biology

By |2019-06-10T15:52:10-07:00May 26th, 2017|Biology|0 Comments

A flatworm When did flatworms evolve? The first flatworms, or platyhelminthes, probably evolved from something like a hydra about 550 million years ago. What's a hydra? Proterozoic Eon All our biology articles Like all other living things at this time, these early flatworms all lived in the ocean. A flatworm has a body [...]