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Which of the following is NOT one of the six major kingdoms?

  1. Archaebacteria

  2. Bacteria

  3. Monera

  4. Protista

The correct answer is: Archaebacteria

The correct answer is A. Archaebacteria is NOT one of the six major kingdoms. The six major kingdoms are Animalia, Plantae, Fungi, Protista, Eubacteria (true bacteria), and Archaebacteria. Archaebacteria is a group of single-celled microorganisms that are similar to bacteria but are genetically distinct, leading to their classification in a separate kingdom called Archaea.