Final answer:
The amphibian of the plant kingdom is bryophytes, which are non-vascular plants that appeared on Earth over 450 million years ago.
Explanation:
Amphibian of the plant kingdom refers to bryophytes, which are non-vascular plants like liverworts, mosses, and hornworts.
These plants appeared on Earth over 450 million years ago and do not have true roots or vascular tissue for water transport.
The kingdom Plantae includes bryophytes, seed plants, ferns, gymnosperms, and flowering plants.
Learn more about Plant Kingdom and Bryophytes here:
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