In case being a mammal hasn’t made you an expert, today’s post covers two of this Class’ underrepresented members: marsupials and monotremes.
In general, mammals are air-breathing vertebrates characterized by three traits: hair, mammary glands in mothers, and three middle ear bones for hearing. After these universal traits, birth method distinguishes the three different groups of mammals.
Placental mammals are by far the biggest group and include humans (along with almost every other mammal that comes to mind). During fetal development, this Group employs a placenta – an organ that connects a gestating fetus to its mother, to supply nutrients and oxygen and eliminate waste.
Placental mammals are by far the biggest group and include humans (along with almost every other mammal that comes to mind). During fetal development, this Group employs a placenta – an organ that connects a gestating fetus to its mother, to supply nutrients and oxygen and eliminate waste.
