Which organisms stain as either Gram-positive or Gram-negative?

Name: Which organisms stain as either Gram-positive or Gram-negative?
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Gram staining is a technique used to differentiate and identify bacteria based on their cell wall composition. Bacteria are the only organisms that have cell walls and, therefore, are the only organisms that can be stained as either Gram-positive or Gram-negative. Mercaria, Archaea, and Eukarya do not have cell walls that can be stained in this way.

Which Organisms Stain as Either Gram-Positive or Gram-Negative