A: an ecosystems organisms become larger as succession
Answer:
Thoracic cavity, also called chest cavity, the second largest hollow space of the body. It is enclosed by the ribs, the vertebral column, and the sternum, or breastbone, and is separated from the abdominal cavity (the body's largest hollow space) by a muscular and membranous partition, the diaphragm.
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Carbon dioxide (CO²) is taken in to start the Calvin Cycle.