Why is scientific classification important?

Without classifacation they wouldnt know one thing from another say germs if they didnt classify germs they wouldnt be able to tell one from another and give a drug to somone to help but instead that person would get sick

Cells of an organism tell each other when predators are near.

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.