diaphragm
the muscles dividing the chest cavity from the abdominal cavity.
mammal
a warm-blooded vertebrate covered with fur or hair, breading air with lungs and a diaphragm, having a 4 chambered heart, and the largest and most developed brai
marsupial
a group of mammals in Australia which give birth to incompletely developed young, and then care for them several months in an external pouch.