Subject: Twin achievement 43 general knowledge quiz questions. It should take around 9 minutes to complete all the questions.

Subject: Twin happiness 14 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: Twin laughter 32 general knowledge quiz questions. It should take around 7 minutes to complete all the questions.

Subject: Twin adjustment 9 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Twin connection 12 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: Identical twin zygosity 9 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Twin empathy 12 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: Twin studies on genetic diversity 25 general knowledge quiz questions. It should take around 5 minutes to complete all the questions.

Subject: Twin studies on obesity 26 general knowledge quiz questions. It should take around 6 minutes to complete all the questions.

Subject: Twin studies on physical fitness 10 general knowledge quiz questions. It should take around 2 minutes to complete all the questions.

Subject: Twin studies on mental disorders 14 general knowledge quiz questions. It should take around 3 minutes to complete all the questions.

Subject: Twin adoption studies 25 general knowledge quiz questions. It should take around 5 minutes to complete all the questions.

Subject: Dizygotic twins raised together 18 general knowledge quiz questions. It should take around 4 minutes to complete all the questions.

Subject: Twins in adoption studies 26 general knowledge quiz questions. It should take around 6 minutes to complete all the questions.

Subject: Monozygotic twin concordance 34 general knowledge quiz questions. It should take around 7 minutes to complete all the questions.

Subject: Double the pleasure 32 general knowledge quiz questions. It should take around 7 minutes to complete all the questions.