Final answer:
Organisms have developed transportation systems to move nutrients, oxygen, and waste products both internally and externally. This includes the circulatory system in humans which uses blood vessels, the heart, and blood to accomplish this task.
Step-by-step explanation:
Organisms are capable of producing systems for transportation, which may be internal (transporting food, blood, etc.) or external (moving through the environment). Inside a complex organism such as a human, the circulatory system plays a crucial role.
It comprises an intricate network of blood vessels, the pumping action of the heart, and the medium of blood. This system delivers oxygen and nutrients to the trillions of cells within the body and removes carbon dioxide and waste products.
Even single-celled organisms must transport materials, though they do so directly with their environment without the need for blood.