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Which of the following best explains why productive workers can command high wages?
Flynn Effect
The observed substantial and long-sustained increase in both fluid and crystallized intelligence test scores measured in many parts of the world over the 20th century.
Identical Twins
Twins that result from one fertilized egg splitting and forming two embryos, sharing 100% of their genetic material.
Fraternal Twins
Siblings born at the same time but developed from separate eggs fertilized by different sperm, sharing 50% of their DNA.
Single Birth Siblings
Siblings who are not twins or multiples, born from separate pregnancies.
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