1. Cells: The Basic Units of Life
Chapter 3
Cells: The Basic Units of Life

2. Organization of Life All living things have one or more cells
Not all of our cells look the same
Humans have over 2oo types of cells each specialized for different jobs

3. Tissues
A group of similar cells that work together to perform a specific job in the body

4. Organ
A combination of two or more tissues that work together to perform a special function in the body

5. Organ System
A group of organs that work together to perform body functions

6. Organism
Anything that can independently carry on life processes

8. Unicellular vs. Multicellular
Unicellular- organism made of one cell
Multicellular- organism made of many cells

9. Population
A group of individuals of the same species that live together in the same area at the same time

10. Community
All of the populations of different species that live and interact in an area

11. Ecosystem
A community of organisms and their nonliving environment