Weegy: What animal body structures are mainly involved osmoregulation? Malpighian User: Which of the following is NOT true about Malpighian tubules?
They are extensions of the digestive tract, near the rectum.
They remove water from the body cavity.
They work by the active transport of potassium ions and cellular waste.
They are found in osmoconformers.
They are never found in vertebrates. (More)