Passive immunity lasts only as long as the antibodies survive in body fluids.
Inside the body, blood is normally a fluid.
Passive immunity lasts only as long as the antibodies survive in blood.
passive immunity lasts only as long as the antibodies survive where?
[1] cows
[2] heat
[3] skin
[4] Mitosis
[5] blood
[6] humans
[7] Summer
[8] animals