[ 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

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Gerund or InfinitivesAbstract NounsFuture Tense - will and going toWill and Going toCompliment, Congratulation, and HopeRelative Pronouns with PrepositionsSimple Present and Past TensesFormal & Informal WordsNouns as AdjectivesSimple and Progressive Verb TensesOther quiz:
Conjunctive Adverbs › ViewWhich of the following is used to show addition?
A. in conclusion
B. furthermore
C. instead
D. however
Conditionals › View
______ he truly to desire this position, he would never give up on any chance.
A. had
B. should
C. if
D. were
Homonyms › ViewHe had no food, the poor ___.
a. retch
b. wretch
Vocabulary › View
Agreement between two or more sides in which each side gives up some of what it wants.
A. compromise
B. cabinet
C. bicameral
D. amendment