The primary function of the heart is to move blood through the body. The purpose of the heart is to help perform athletic activities. The rate of a beating heart can change throughout the day. The heart is composed of different types of cells.
Which statement is an opinion about the heart?

Options:
- The primary function of the heart is to move blood through the body.
- The purpose of the heart is to help perform athletic activities.
- The rate of a beating heart can change throughout the day.
- The heart is composed of different types of cells.

The purpose of the heart is to help perform athletic activities.