An organism has the following traits:
• Unicellular
• Complex cell structure
• No nucleus
• Make up most of plankton
What kingdom does this most likely belong in?

Archaea

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Google defines it as:

"a region of the forebrain below the thalamus which coordinates both the autonomic nervous system and the activity of the pituitary, controlling body temperature, thirst, hunger, and other homeostatic systems, and involved in sleep and emotional activity."

basically, its a part of the brain below the thalamus and it controls your homeostatic systems. it also helps decide if you're gonna get good sleep and how you feel