CA.LS. Life Sciences
LS.2. Plants and animals have structures for respiration, digestion, waste disposal, and transport of materials. As a basis for understanding this concept:
LS.2.a. Students know many multicellular organisms have specialized structures to support the transport of materials.
LS.2.b. Students know how blood circulates through the heart chambers, lungs, and body and how carbon dioxide and oxygen are exchanged in the lungs and tissues.