Is duodenum the same as pilorik sfinkter?

In which of the following relationships is one organism always benefited while the other organism is always harmed

What was the impact of the concordat of worms?

What are some of the immune functions of the lymphatic system? a. cleaning red blood cells from the blood and creating lymph fluids b. transporting lymph to the tissues and creating lymph fluids c. removing infectious agents and making white blood cells d. making red blood cells and removing infectious agents