why+life+cycles+of+organisms+have+varied+lenghts

=** Here is some information about cell life and the life cycle of these cells. **=

__How long does the average cell live?__
==== Well, to answer this question, life cycle of organisms never have a "certain" amount of time to live. As many people have discovered, cells have no average life span time. The life time depends on the type of cell it is. One cell may live up to a day, another, a lifetime. Cells come in many shapes, sizes, and functions. Because of this, that is the reason they have different life span times. ==== ==== The single cell items, such as Bacteria, do everything on their own. They move, eat, digest, make energy to run on, reproduce and die. All types of cells depend on their neighbors and other cells in order to survive. Large co-ops of similar cells form tissues. Tissues cooperate and form organs. Organs carry out the basic functions of an organism. ==== ==== An example of a long-living cell: stem cells last a lifetime maintaining a lifelong supply of both red and white blood cells for an organism. Even longer lived are bacteria spore, which can live much longer lives than the parent bacteria. If a bacteria senses bad times, it forms spores to suspend and keep away the life-threatening conditions. ====

This means: that molecules that compare to cells on the surface to signal the cell to begin the program.
Here are the website links about the cell life and life cycles.

[|here is another website i got some information on]

[|Cell Cycle in Eukaryotes.]

[|life cycle of a cell]

[|another one on life cycle of a cell]

[|How cells work]

[|i got alot of my information from this website]