Why do taxonomists classify organisms into groups like domains, kingdoms, and phylums based on their shared characteristics?

Because if they have shared characteristics then they might have a common ancestor or share some part of DNA so they wouldn't want to classify two animals that have nothing to do with each other because then it wouldn't make sense that's why they classify things by what species and their traits and all that. Hope this helped (Please mark brainliest)

Because that is the most accurate way to label them.

Cells store their energy in the form of ATP. Known as adenosine triphosphate.