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What is the relationship between the complexity of organisms from the five kingdoms and their time of appearance on Earth?

User Bobthemac
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In terms of complexity and their time on Earth, the kingdom hierarchy would be: Monera ⇒ Protista ⇒ Fungi ⇒ Plantae ⇒ Animalia. Monera are unicellular (ie. not complex) and are the eldest, while Animalia are multicellular and the youngest.
User Areza
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