Shao-Mei and Elisha, who are good friends, decide to donate blood. Shao-Mei discovers that her blood group is AB Rh− and Elisha’s blood group is O Rh− . Explain how Elisha could help Shao-Mei if she...

Shao-Mei and Elisha, who are good friends, decide to donate blood. Shao-Mei discovers that her blood group is AB Rh− and Elisha’s blood group is O Rh− . Explain how Elisha could help Shao-Mei if she ever needed a blood transfusion. Why cannot Shao-Mei help Elisha in the same way?

A woman comes to the clinic complaining of fatigue, shortness of breath, and chills. Blood tests show anemia, and a bleeding ulcer is diagnosed. What type of anemia is this?