B - Antibiotics
Antivirals treat viruses, antifungals treat fungi, and OTC treatments are merely symptomatic treatment. Antibiotics typically dissolve the cell wall of bacteria meaning they explode, so they actually kill the bacteria.
Answer - Ground water erosion is a type of carbonic acidic water. That goes into the holes thru the soil and pretty much cracks thru rocks.
D) A & B
it protects the seed against any damage or harmful weather conditions and also helps in dispersal of the seed through different means.
Answer: The respiratory system, the circulatory system, and the muscular system
Hope this helps :)