Final answer:
Organ systems like the digestive and circulatory systems, as well as the respiratory and cardiovascular systems, work together to sustain life.
Step-by-step explanation:
An example of organ systems working together to sustain life is the digestive and circulatory systems. The digestive system breaks down food into nutrients that can be absorbed by the body, while the circulatory system transports these nutrients to the cells. For example, when you eat a sandwich, your digestive system processes the food, breaking it down into smaller molecules. These molecules are then absorbed into the bloodstream by the small intestine, and the circulatory system transports them to the cells throughout the body.
Another example is the respiratory and cardiovascular systems. The respiratory system enables us to breathe in oxygen, while the cardiovascular system transports oxygen-rich blood to the body's tissues. For instance, when you inhale, your respiratory system takes in oxygen-rich air, which travels to the alveoli in the lungs. The cardiovascular system then carries this oxygenated blood through the arteries to the body's cells.
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