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

Ahypothesis that has been tested again and again , with similar results each time may become a law , true or false

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.