Its flu season and a lot of people are getting the flu vaccine. This vaccine is to help boost the immune system by having the B-cells produce antibodies against the flu virus so that they are ready to attack just in case the person contracts the flu. Explain in detail 3 system interactions that aid the immune system with fighting off pathogens. I NEED HELP ASAP

Which best describes the digestive system of arthropods? a incomplete, two openings b complete, one opening c two-way, one opening d one-way, two openings

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis