An illustration is shown through the following three steps.

1. Step 1: Respiratory and Circulatory Systems - Shows deer's two sided face. Left facing face is gathering oxygen to distribution to the body systems. Right facing face is release of carbon dioxide from body tissues and eliminates from the body. The following text is written: Gathering of O2 and its distribution to body systems. Collection of CO2 from body tissues and its elimination from the body.
2. Step 2: Digestive and Circulatory Systems - Shows a deer eating grass with the following text written: Acquisition of nutrients and their distribution to body systems.
3. Step 3: Digestive, Circulatory and Excretory Systems - Shows a deer urinating with the following text written: Collection of metabolic wastes from body tissues and their elimination from the body.