1. Levels of Organization

2. Unicellular Organisms
Unicellular organisms are made of only one cell.
They can be:
Prokaryotes- do not have a membrane-bound nucleus
Eukaryotes- have a nucleus surrounded by a membrane and other specialized organelles.

3. Multicellular Organisms
CELLS
Each type of cell in a multicellular organism has a specific job that is important to the survival of the organism
Cells become different types during cell differentiation
Stem cells- unspecialized cells that can develop into many different cell types
Stem cells can produce new muscle cells when fibers are torn
In plants, these unspecialized cells are called meristems.

4. Tissues
Tissues -groups of similar cells that work together to carry out a specific task
Animals have 4 main types of tissue:
muscle
epithelial
nervous
connective-(ex: blood, bone, cartilage)

5. Plants have 3 main types of tissue:
dermal
vascular
ground

6. Organs
Organs -groups of different types of tissues working together to perform a particular job
A leaf is a plant organ that specializes in photosynthesis.

7. Organ Systems
Organs Systems-groups of different organs that work together to complete a series of tasks.
Ex:
Digestive system includes the stomach and intestines
Plants have 2 major organ systems:
shoot system
root system
Multicellular organisms usually have may organ systems
Each organ system depends on the others and cannot work alone

8. .

10. Cells
Tissues
Organs
Organ System
Organism