What is common in whale, bat and rat? (a) Absence of neck (b) Muscular diaphragm between thorax and abdomen (c) Extraabdominal testes to avoid high temperature of body (d) Presence of external ears
Option B Whale, bat and rat are mammals. Diaphragm is present in mammals. The diaphragm separates the thoracic cavity (with lung and heart) from the abdominal cavity (with digestive system and urogenital system). In its relaxed state, the diaphragm is shaped like a dome. It is controlled by the phrenic nerve.
