1. 7-4 The Diversity of Cellular Life
Earth – The Living Planet

2. Unicellular Organisms
A single celled organism can do everything that you would expect a living thing to do.
They grow, respond to the environment, transform energy, and reproduce.
Unicellular organisms dominate the earth.

3. Multicellular Organisms
Cells throughout an organism can develop in different ways to perform different tasks.
This is call cell specialization.
Examples of specialized animal cells include:
Red blood cells
Muscle cells
Pancreatic cells

4. Specialized Plant Cells
Examples of specialized plant cells include:
Stomata
Guard cells

5. Levels of Organization
The levels of organization in a multicellular organism are;
Individual cells
Tissues – group of similar cells that perform a particular function
Organs – group of tissues that work together
Organ systems – a group of organs that work together to perform a specific function

6. Levels of Organization Example
Individual cell – muscle cells
Tissue – smooth muscle tissue
Organ – stomach
Organ system – the digestive system