Chernobyl disaster is the result of pollution by_____________
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The largest dolphin species is the orca, also called as ________.
Marble is a metamorphic rock of _______.
What was the shape of the galaxy named A1689 B11 that existed 11 billion years ago?
The source of energy in an ecosystem is
Carbon dioxide is produced by all of the following except
The longest day of the year in the Northern Hemisphere occur on _____.
Charcoal can be made at home by burning