4. Did you know???
• Both plants and animals can be made of one cell-or
millions of cells like you.
• One-celled (single-celled) organisms, however,
tend to be different from those with many cells.
– Some single-celled creatures have a nucleus, and some
do not.
– Some single-celled plants have chloroplasts, but not all
have stiff cell walls.
– All single-celled organisms eat, get rid of wastes, and
reproduce.
5. Single-Celled Organisms
• Amoebas, Algae, Plankton, and bacteria
are single-celled organisms.
• You need a microscope to see single-
celled organisms.
http://www.youtube.com/watch?v=7pR7TNzJ_pA&NR=1&feature=fvwp
http://www.youtube.com/watch?NR=1&v=fh_yjLppNAg&feature=endscreen
6. Multi Celled Organisms
• Living things made up of more than one
cell are multi-celled organisms.
• You are a multiple celled organism.
• Can you think of any other multi-celled
organisms?
8. Single-celled organisms are made of only one
cell.
Example: algae, amoeba, paramecium
Multi-cellular organisms, such as plants and
animals, have a higher degree of specialization
where the cells work together and function to
create a living organism.
Example: a human – starts as a single cell. Then
organize themselves into three groups called germ
layers. One layer will form the skin and nerves,
Another layer becomes the lining of the digestive
tract. The third layer produces all other body parts.
http://www.youtube.com/watch?v=qEHQbjido9I
