<span>The Cell Theory states that all plants and animal
tissue are made up of tiny units. It is one of the most basic principles of
Biology. Theodor Schwann, Matthias Schleiden, <span>and
Rudolph Virchow were credited for this theory.
The Cell Theory states that cells are the basic unit or the building blocks of
life and that all cells existed or arose from
pre-existing cells. The theory also states that all living organisms are made
up of either unicellular or multicellular cells that have energy flow and
are responsible for many processes in the bodies of living organisms.
The modern definition of the theory is that all cells have the same basic
compositions and DNA is passed on from cell to cell. </span></span>
There's been a lot of bad news for polar bears recently. In 2007, for example, scientists reported that if global warming continues unabated, the population could drop two-thirds by 2050.
