#1, they remain outside the target cell. #2, bind to the receptors inside the target cell. #3, they have no target cells. #4, are made of proteins.
You wouldn't be able to see
I believe it is the connective tissues
A. Sickle cell anemia. The red blood cells in the hereditary disease sickle cell anemia have a characteristically shape of a sickle, a moon shape, rather than a normal disc shape.
Answer:
Ban: Health protection
Medical: Both
Carpooling: Both
Testing: Health protection
Health Edu.: Health promotion
Explanation: