Cells are the basic unit of life and were first discovered in 1665 by Robert Hooke using a microscope. The cell theory states that cells are the basic unit of life, all organisms are made of cells, and cells come from pre-existing cells. Cells group together to form tissues, tissues form organs, and organs work together in organ systems to carry out essential functions in the body. A living thing made of one or more cells is called an organism.

1. Organization of Life Mr. Miller

2. The cell is the smallest unit of life and every living thing has at least one cell. There are different types of cells in our body (bone cells, blood cells, skin cells etc.). Living Things are Organized

3. Cells were discovered in 1665 by a scientist named Robert Hooke. He was able to observe the cell with the use of the microscope. When Were Cells First Discovered and by who?

4. The fundamental characteristics of the cell are described in the cell theory, which states: Cells are the basic unit of life All organisms are made up of cells All cells come from pre-existing cells What are the fundamental characteristics of the cell?

5. Cells group together to form tissues. Tissues are a group of cells that work together to perform a specific job in the body. How do tiny cells make up large organisms?

6. Our bodies possess four specific types of tissues which include: 1. Epithelial tissue 2. Connective tissue 3. Muscle tissue 4. Nerve tissue Are there different types of tissues?

7. Two or more tissues working together to perform a specific job are called organs (examples of organs are stomach, intestines, heart, lungs, and skin). What about a group of tissues?

8. Organs working together in groups are called organ systems. Each system has a specific job to do in the body. For example, the digestive systems job is to break down food into small particles so that it can be used by all of the body’s cells. The organs in the organ system depend on each other, if one part of the system fails then the entire system is affected. What do a group of organs make up?

9. An organism is anything that carries out the characteristics common to all living things independently. A single cell performs the characteristics common to all living thingson its own is called a unicellularorganism. Cells that can only survive by remaining a part of a group are known as Multicellular. Can you think of a multicellular organism? What is the scientific name for living things?