The one that provides short term energy and structure to the body

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an

Which direction does the energy flow in this energy pyramid ?

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?