Cells

=**Cells By Jared and Celeste **=
 * What's a cell? **
 * A cell is the smallest living thing. On Earth, the first cells got started about 3.5 billion years ago, about 2.5 billion years after the Earth first formed! Every living thing is made of cells! Cells all have different shapes and sizes. The biggest cell is the yolk of a ostrich's egg.﻿ **


 * What do cells look like? **
 * Cells are mostly clear, but can be red. Cells have a membrane that holds things together. In a cell membrane there are two major compartments, the cytoplasm and the nucleus. Each cell is different than each other! **


 * How are cells made? **
 * Blood cells are formed in bone marrow. **


 * Why are cells important? **
 * Cells are important because they are the building blocks of life. Anything less than a cell is only chemical. The human body has 100 trillion cells. Some of the cells attack invaders at the site of an infection. **

Muscles link [|sight to look at]
 * Circulatory link **
 * Digestive System link **

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