Biological sibling differences can be due to

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Biological sibling differences can be due to genes, family environment differences, and nonshared environmental influences. Genes account for approximately 50% of individual differences in intelligence and other traits, while family environment differences (such as birth order and parental treatment) can also play a role. Nonshared environmental influences (such as different peer groups and life experiences) can also result in differences between siblings. Therefore, all of the above options (genes, family environment differences, and nonshared environmental influences) can contribute to biological sibling differences.

Biological Sibling Differences Can Be Due to