On a remote island, a new animal is found. It has a four-chambered heart and lungs and is endothermic. It has internal fertilization, lays shelled eggs, and nurses its young after they hatch. This animal is most likely a(n):

Question

Quizplus · Accepted Answer

The characteristics described in the question match those of a monotreme, which is a type of mammal that lays eggs (shelled) and nurses its young. The fact that it has a four-chambered heart and lungs and is endothermic also confirms that it is a mammal. Reptiles and amphibians have a three-chambered heart, and coelacanths are a type of fish, which lack lungs and are not endothermic. Marsupials give birth to relatively undeveloped young that complete development in a pouch, which is not mentioned in the description of the new animal.

On a Remote Island, a New Animal Is Found