In an amphibious manner; in a way that involves or relates to living in both aquatic and terrestrial environments.
From 'amphibious' (adjective) plus the adverbial suffix '-ly,' which transforms adjectives into adverbs describing how something is done or exists.
Frogs reproduce amphibiously in a way that's utterly bizarre to us—they can absorb oxygen through their skin while underwater, yet some species have evolved to lay eggs in foam nests that dry out, forcing tadpoles to wriggle to water.
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