When a pathogen, or infectious agent, invades an organism, which cells produce antibodies to fight infection? a) red blood cells

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Anurse is preparing to administer ampicillin 500 mg in 50 ml of dextrose 5% in water (d5w) to infuse over 15 min. the drop factor of the manual iv tubing is 10 gtt/ml. the nurse should set the manual iv infusion to deliver how many gtt/min? (round the answer to the nearest whole number. use a leading zero if it applies. do not use a trailing zero.)