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a bioweapon, a biological weapon
The use of bioweapons is prohibited by international law.
(marine biology) Synonym of ネクトン (nekuton, “nekton”)
The study of nekton is an important part of marine biology.
biological clock
My biological clock is disrupted, and I've been having sleepless nights.
invasive species
Invasive species can have a major impact on the natural environment.
a sea otter
A sea otter is a very cute animal that lives in the sea.
(archaic) a sea lion
In the old days, people were moved by the strength and beauty of the sea lion.
(rare) a sea lion
A sea lion is a type of marine animal, and it is very rare.
(rare, zoology) a sea lion / (rare, zoology) a seal
The sea otter is a rare animal, and its ecology is not well known.
(very rare, zoology) a sea lion / (very rare, zoology) a seal
The sea otter is a very rare animal.
Irish Sea
The Irish Sea separates the UK and Ireland.
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