What do organs combine to form? a. cells b. organisms c. organ systems d. tissues

Explanation:

Organ systems, such as the circulatory system, are made up of many organs working together. For example, the circulatory system is made up of the heart, veins, and lungs.

where is the scientific experiment?

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.