LD50 is used to express TOXICITY OF TOXINS AND POISONS.
LD50 stands for Lethal Dose 50. This is the standard measure of the toxicity of a material, which will kill half of the sample population of a particular test animal in a defined time period, when they are exposed to the material.
Bacteria and fungi carry out decompostion of plants and animals
I would say the best answer out of all the options would be "C) <span>The body organs would stop functioning properly"</span>
