30 ! plz answer! which is the correct definition of antibodies? a. a preparation of dead or weakened pathogens that is injected into the body to cause the immune system to produce antibodies. b. proteins that attach to antigens, keeping them from harming the body. c. substances that send the immune system into action. d. special white blood cells in the lymph.\\

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos