What is a quasar?
A. system of stars held together by gravity.
B. star that emits intense radio and light energy.
C. star that emits a repeated radio signal.
D. collapsed star emitting no light.
E. Two stars moving around each other.
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Ответ:
spider = molting
Clam= mantle
Earth worm= coelom
Starfish= endoskeleton