mitosis

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What is a spore? – Plant reproduction – Biology

By |2018-04-13T23:51:51+00:00May 30th, 2017|Biology|

Fern spores on the underside of a frond When plants like moss first began to grow outside the water, about 540 million years ago, they needed a way to reproduce themselves that didn't depend on water so much. Some of these plants evolved to be able to produce spores. To make spores, plants [...]

Plant reproduction – Biology – Science

By |2018-04-13T17:52:39+00:00May 30th, 2017|Biology|

Cell division The very earliest photosynthesizing plants on Earth, about 3 billion years ago, had only one cell, and they reproduced the way most one-celled creatures do, by mitosis: splitting themselves in half. By about two billion years ago, some of these cells began to split themselves in a more sophisticated way, called [...]

What is moss? Plant Biology and Evolution

By |2017-05-29T22:55:45+00:00May 29th, 2017|Biology|

A moss-covered rock During the Cambrian period, about 540 million years ago, some early plants evolved from earlier algae that could live on land, outside of the water. These plants were like modern moss. All of the animals were still living in the water, so on land there was only moss and mushrooms. [...]

Eggs – Evolution and Biology

By |2018-04-16T10:33:22+00:00May 29th, 2017|Biology|

Fish eggs 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 that could combine with the cells from another creature to make a new creature. These were [...]

What is mitosis? Sexual reproduction – Biology

By |2017-05-29T00:31:28+00:00May 29th, 2017|Biology|

Eukaryote cells generally reproduce themselves using a method called mitosis. When a eukaryote cell senses that there is plenty of food around, it splits into two new cells that together can eat more food. But it's pretty complicated for eukaryote cells to divide. They have a lot of DNA molecules, to control all the different parts [...]

Fish eggs and chicken eggs – Evolution and Biology

By |2018-04-13T14:34:41+00:00May 27th, 2017|Biology|

Fish eggs Check out different kinds of eggs and you'll see the difference between fish eggs, which are soft and have to be in the water to survive, and the eggs of land animals, which are hard so they can survive on dry land. It's pretty easy to get fish eggs: they sell [...]