The Life of a Cell

The life of a cell is very complex. It is a cycle that ends where it begins. When you were conceived you consisted of only one cell. Now you are made of more than six trillion cells.

Created with CAST's UDL Book Builder
CAST would like to thank Texthelp Inc. for use of the SpeechStream toolbar

Where did all of your cells come from if you started out as only one cell?

Listen

Select this then click anywhere in the book to start reading text Speak the current selection Stops speech playback Double-click a word in the book and click this icon to translate the word into Spanish