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birds of a feather flock together
He is always hanging out with bad friends. Truly, birds of a feather flock together.
Clipping of 一般相対性理論 (ippan sōtaisei riron, “general relativity”).
He is writing a thesis on the theory of general relativity.
(relativity) general relativity
General relativity is a theory of physics proposed by Einstein.
a cnidarian
Cnidarians are a type of marine life, including jellyfish and corals.
petting zoo
We went to the petting zoo on the weekend.
(marine biology) zoobenthos
The ecosystem of zoobenthos is an important field of study in marine biology.
(zoology) echinoderm
Echinoderms are a type of marine life, many of which have star-shaped bodies.
annelid
The characteristic of annelids is that their bodies are divided into ring-shaped segments.
a tardigrade; a water bear
A tardigrade can survive in extreme environments.
invertebrate
Invertebrates are a type of creature without a skeleton.
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