Cells

In Science, one thing we are learning about is cells. Cells are a basic unit every organism, humans, animals, etc., need to survive. There are two main types of cells, eukaryotic and prokaryotic. A PROKARYOTIC CELL contains no nucleus. A EUKARYOTIC CELL does contain a nuleus. The cell organization is the following(-->=makes):
CELL-->TISSUE-->ORGAN-->SYSTEM.

I think learning about these microscopic organisms was interesting because it helped me realize how important they really are. I mean, they are the building blocks of your life! During the day, you don't really think about cells, but, really, they are what help you think.

These are some more interesting facts:
1.) The largest cell known is an ostrich egg.
source:WIKIPEDIA
hyperlink: http://www.en.wikipedia.org/wiki/Cell_(biology)
2.)Humans are estimated to have around 100,000,000,000,000 cells in their body.
source: National Center for Biotechnology Information
hyperlink: http://www.ncbi.nlm.nih.gov/About/primer/genetics_cell.html

PICTURE from: (click on picture to see a larger image) http://www.merck.com/media/mmhe2/figures/fg001_2.gif