Answer:
This organism belongs to kingdom Archaebacteria
Step-by-step explanation:
Archebacteria are prokaryotic organisms which live in harsh climate like hot springs, salt marsh, arctic climate, acidic climate, etc. They lack membrane-bound nucleus and they reproduce asexually. They are unicellular like bacteria.
Earlier archaea and bacteria are considered into the same domain but after comparing their ribosomal sequence with bacteria and eukaryotes it was found that archaea is more closely related to eukaryotes than bacteria.
Archea who are present in hot spring produce those enzymes that help them to survive in high temperatures. So the correct answer is kingdom Archaebacteria.