According to your textbook, what is the most likely explanation for why first-born children tend to have higher IQ's?
A) prenatal exposure to flu
B) they are the oldest sibling and tutor younger siblings
C) temperature during infancy
D) exposure to sunlight during infancy

Question

Quizplus · Accepted Answer

The textbook suggests that first-born children tend to have higher IQ's because they have the opportunity to tutor their younger siblings, thus reinforcing their own learning and knowledge.

According to Your Textbook, What Is the Most Likely Explanation