All veins return blood back to the heart except A-superior vena cava B-inferior vena cava C-Hepstic portal vein D-hepatic vein

C- Hepatic portal vein

Explanation:

The hepatic portal vein is a vessel that moves blood from the spleen and gastrointestinal tract to the liver.

The portal vein supplies approximately 75 percent of blood flow to the liver. It's not a true vein, which means it doesn't drain into the heart. Instead, it brings nutrient-rich blood to the liver from the gastrointestinal tract and spleen. Then the liver can process the nutrients from the blood and filter out any toxic substances it contains before the blood goes back into general circulation.

the cell theory states that all living things including animals, as well as plants, are made of cells.