Final answer:
The three ways of combining cells are tissues, organs, and organ systems.
Step-by-step explanation:
The three ways of combining cells are:
- Tissues: Cells of the same type come together to form tissues. Each tissue has a specific function. For example, muscle tissue is made up of muscle cells that contract to generate movement.
- Organs: Different types of tissues work together to form organs. Organs have specific functions in the body. For instance, the heart is an organ made up of different types of tissues that work together to pump blood.
- Organ Systems: Multiple organs work together as part of an organ system. Organ systems carry out specific functions in the body. An example is the digestive system, which includes organs like the stomach, small intestine, and liver that work together to break down and absorb nutrients.