Which explains the relationship between the respiratory system and the circulatory system in an organism? A. The respiratory system takes in oxygen. The circulatory system delivers the oxygen to cells.
B. The respiratory system takes in oxygen. The circulatory system removes wastes from the body.
C. The respiratory system delivers oxygen to cells. The circulatory system controls the body's activities.
D. The respiratory system delivers oxygen to cells. The circulatory system provides support to cells.

This is a typical grassland food web. it is also a small picture of an important cycle on earth: the carbon cycle. describe how the carbon gets into this food web. a) bacteria and fungi, the decomposers, recycle carbon from dead organisms. b) carbon is found in the grass and is passed from one level to the next in this food web. eliminate c) all living things give off carbon dioxide as a by-product of respiration and it is released into the atmosphere. d) plants use carbon dioxide as a reactant in photosynthesis, to make usable chemical energy in the form of a sugar.