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The cartilaginous fishes, chondrichthyans.
Cartilaginous fishes do not have bones, instead their bodies are supported by cartilage.
ichthyology
He is an expert in ichthyology and has a deep knowledge of marine life.
knowledge is power
He says 'knowledge is power' and studies hard every day.
intellectual
He is widely recognized as an intellectual in that field.
trivia
Did you know this trivia?
one-line fact / one-line information / information in very few words
By learning a one-line fact every day, your knowledge will increase.
scientific knowledge
He has a wealth of scientific knowledge and is always excited about new discoveries.
of the sea, of the ocean
The sea breeze feels comfortable.
a female given name
Umi is my best friend.
(obsolete) sea, ocean
He found the sea on an old map.
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