Marsupials, such as kangaroos and koala bears, are mammals. Humans are mammals, too. However, there are differences between mars
upials and humans. For instance, the average baby human is born after spending 38-40 weeks inside of its mother, but baby marsupials are born after only 4-5 weeks. What feature does a marsupial possess that allows babies to be born earlier? A. an egg sac B. a pouch C. fur D. a uterus
In each ventricle is a blood vessel network called the choroid plexuses that produces cerebrospinal fluid. This blood vessel consists of ependymal cells
