The circulatory system is an organ system that is composed of __________. Select one of the options below as your answer:
Acells, organs, and organisms
Bcells, tissue, and organisms
Ctissue, organs, and organisms
Dcells, tissue, and organs
Acells, organs, and organisms
Bcells, tissue, and organisms
Ctissue, organs, and organisms
Dcells, tissue, and organs