Question

What do studies on identical twins raised apart demonstrate?

Options

• The environment has no effect on development.

• Heredity plays no role in intelligence.

• Both heredity and environment contribute to development.

• Twins will always be exactly identical.

Answer 1

Both heredity and environment contribute to development.

Explanation: 

Identical twins raised apart show similar intelligence (proving genetic influence), but also display differences due to their different environments, demonstrating that both heredity and environment are important factors.