How do the digestive system and the circulatory system work together in the human body?
A. The digestive system sends electric messages, while the circulatory system responds to the messages.
B. The digestive system provides structure for the body, while the circulatory system directs the movement.
C. The digestive system removes liquid toxins from the body, while the circulatory system removes solid waste.
D. The digestive system extracts nutrients from food, while the circulatory system transports those nutrients.
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Which statement describes the organization of living organisms?
A. All organisms are composed of many cells, which are the basic units of structure but do not perform life functions.
B. All organisms are composed of one or more cells, which are the basic units of structure and perform essential life functions.
C. All organisms are composed of many cells that have basic units with unique structures and functions.
D. All organisms are composed of one or more cells with the same shape and purpose but are not the basic units of structure.