Hydrobiological is an adjective.
"Noun".
It can be either an adjective: A cellular building, a cellular phone; or a new noun, meaning "cellular phone".
"Bi" can function as a prefix in English, typically meaning "two" or "twice." It is not a standalone part of speech but a morpheme that can be added to words to modify their meaning.
Mutate is a verb.
Evolution is a noun.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "breezy" is an adjective.