according to the cell theory, which structure contains cells?\no blood\no water\no carbon dioxide\no…

Brief Explanations:

Cell theory states that all living organisms are made of cells. Blood is a tissue composed of different types of cells like red - blood cells, white - blood cells, and platelets. Water is a molecule, carbon dioxide is a gas molecule, and a chromosome is a structure within a cell that contains DNA.

Answer:

A. blood