1. Life: Levels of Organization

2. Life is organized into different levels
the single living thing: the organism •organ systems •organs •tissues •cells •organelles •molecules •atoms

3. Organism
A living thing
animal
plant
animal
cabbage
rabbit
human

4. Organ systems Organ systems have a specific job or function
For example: the digestive system

5. stomach
Organs
small intestine
Organs are structures that have a function or job in an organ system

6. Tissue Organs are built from tissues
A tissue is made from a group of cells that have a special job
Example: muscle tissue

7. Cell A cell is the most basic unit of life
The cell’s structure depends on the cell’s job or function
All cells have certain things in common: Cell membrane, DNA, RNA, organelles

8. DNA is a large molecule that is in most cells
A molecule is a group of atoms joined together by chemical bonds
DNA controls how the cell works and the cell’s job
DNA has a special structure or shape which is called a double helix

9. A molecule is made of atoms connected by chemical bonds
A simple molecule made of 3 atoms:
A chemical bond is the energy that keeps two or more atoms connected
An atom is the smallest piece of matter that cannot be broken down and still keeps its properties
Properties of matter include mass, density, freezing point, melting point and more

10. An atom is the smallest piece of matter that keeps its properties
In the middle of the atom is the nucleus that is made of protons and neutrons
Electrons surround the nucleus in a cloud