Barbara and Brenda Are Identical Twins Who Were Adopted at Birth

question 24

Multiple Choice

Barbara and Brenda are identical twins who were adopted at birth and raised by two different families.Andy and Andrew are identical twins raised together by their biological parents.When the four children entered high school they took an IQ test.Barbara and Andy each had scores of 110,while Brenda's IQ was measured at 120 and Andrew scored 108.These results support which of the following conclusions?

• A) intelligence is influenced by the environment only in extreme conditions
• B) intelligence is almost entirely shaped by the environment except when rare genetic disorders are involved
• C) intelligence is shaped by genetics as well as environmental influences
• D) intelligence is entirely determined by genetics

---

Definitions:

Landfills

Designated areas where waste is isolated from the environment until it is safe to be integrated with the natural environment.

Polymers

Large molecules composed of repeated subunits, playing essential roles in natural and synthetic materials like DNA and plastics.

Covalent Bonds

Bonds formed by the sharing of electron pairs between atoms, enabling stability in their outer electron shell and contributing to the formation of molecules.

VSEPR

Valence Shell Electron Pair Repulsion theory, a model used to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.