1. 7.L.3B.1 Develop and use models to explain how the structural organizations within multicellular organisms function to serve the needs of the organism

2. Levels of organization
Cells  Tissues  Organs  organ systems

3. Cells Examples in Animal Cells Examples in Plant Cells Nerve cells
The basic unit of structure and function within all living things
Examples in Animal Cells
Examples in Plant Cells
Nerve cells
Guard cells
Blood cells
Xylem cells
Bone cells
Phloem cells

4. Tissues
A group of specialized cells that work together to perform a specific function
Examples in Animals
Examples in Plants
Nervous Tissue
Xylem Tissue
Connective Tissue
Phloem Tissue
Muscle Tissue
Epithelial Tissue

5. organs
A group of two or more different types of tissue that work together to perform a specific function
The task is generally more complex than that of the tissue
For example:
the heart is made of muscle and connective tissues which function to pump blood throughout an animal
Flowers, roots, and stems are organs in plants

6. Organ systems
A group of two or more organs that work together to perform a specific function
Each organ system has its own function but the systems work together and depend on one another