meiosis

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23 06, 2017

What happened in the Cambrian Period?

By |2019-02-26T21:09:50-07:00June 23rd, 2017|Geology|0 Comments

Mossy rocks The Cambrian gets started At the beginning of the Cambrian Period, about 542 million years ago, there were sea creatures like hydras, jellyfish, sponges and seaweed living in the oceans, but only one-celled algae on land yet. Proterozoic Era More geological eras All our geology articles First plants and animals on [...]

30 05, 2017

What is a spore? – Plant reproduction – Biology

By |2018-04-13T23:51:51-07:00May 30th, 2017|Biology|0 Comments

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 [...]

30 05, 2017

Plant reproduction – Biology – Science

By |2018-04-13T17:52:39-07:00May 30th, 2017|Biology|0 Comments

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 [...]

29 05, 2017

Cell reproduction – Biology

By |2019-03-08T06:54:01-07:00May 29th, 2017|Biology|0 Comments

A cell dividing into two cells The first reproduction One of the main ways we define whether something is alive is whether it can reproduce - if it can make a new version of itself. The first things we know about that could reproduce were molecules of RNA, more than four billion years ago. What is [...]

29 05, 2017

What is mitosis? Sexual reproduction – Biology

By |2017-05-29T00:31:28-07:00May 29th, 2017|Biology|0 Comments

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 [...]

29 05, 2017

What is meiosis? Cell reproduction – Biology

By |2017-11-24T17:38:10-07:00May 29th, 2017|Biology|0 Comments

At first all eukaryote cells divided using a process called mitosis. But about 1.4 billion years ago, some eukaryote cells developed the ability to reproduce using meiosis instead. Meiosis (my-OH-siss) is a way for cells to get more diversity while they are reproducing. A cell that reproduces by meiosis has twice as much DNA in its [...]

27 05, 2017

Fish eggs and chicken eggs – Eggs science project

By |2019-06-09T19:33:58-07:00May 27th, 2017|Biology|0 Comments

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 eggs, which are soft and have to be in the water to survive, and the eggs of land animals, which are hard so [...]