[ Vocabulary ]
__________ is a technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains
A. isotope dating
B. retroactive dating
C. radioactive dating
D. index fossilization
Select your answer:
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Grammar › ViewAqil is sad because ___ mother scolded him.
A. he
B. his
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Stephen sarcastically commented on Luke’s dismal failure of scoring the goal.
What part of speech is ‘failure’?
A. adverb
B. adjective
C. common noun
D. abstract noun
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