Though Katie and Wendy Were Identical Twins,Katie Always Felt That

Multiple Choice

Though Katie and Wendy were identical twins,Katie always felt that her sister was given the best opportunities when they were growing up.Katie went to a public school,while Wendy was allowed to attend a prestigious private school.Katie was not given the freedom that Wendy enjoyed and took for granted.Which of the following is a nonshared experience for Katie and Wendy?

A) Birth order
B) Gender
C) Genetic material
D) Parental treatment