Erythropoiesis (from Greek 'erythro' meaning red and 'poiesis' meaning to make) is the process which produces red blood cells (erythrocytes).
Birds and mammals have the following characteristics in common: they are vertebrates, meaning they have an internal skeletonthey are warm-bloodedthey breathe using lungs, so â¦ have full respiratory systems they have circulatory systems. Most mammals give live birth, but there is a sub-group known as monotremes, which are the egg-laying mammals. 2  This group includes just the platypus and the echidna. 3  They are still mammals because, like all mammals, they feed their young on mothers' milk.
What are the characteristics that all mammals share? There are two essential characteristics shared by all mammals.   Firstly, they all have some form or fur or hair, whether it be a  full coat, or just a few whiskers.  â¦ Secondly, they all feed their young on mothers' milk.    Many people believe all mammals give live birth.