How many electrons are in the outer energy level of the atoms of alkaline-earth metals?

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

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?

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