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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.
the Arctic Ocean
The Arctic Ocean is a cold and beautiful sea.
the South Polar Ocean; the Antarctic Ocean
The South Polar Ocean is the coldest sea on Earth.
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