Jack and Jill are twins. Because he is a boy, Jack's parents ...

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Jack and Jill are twins. Because he is a boy, Jack's parents encourage him to run. However, they discourage Jill from engaging in athletic activity. As a result, Jack is much faster at running up a hill than Jill. The difference in Jack and Jill's behavior is best explained by
 
  a. nonshared environmental influences.
  b. active gene-environment relations.
 c. polygenetic effects.
 d. niche-picking.

Question 2

From whom would you expect the biggest gains in height and weight over the next three years?
 
  a. Ginger, who is 2 years old
  b. Grant, who is 6 years old
 c. Tina, who is 11 years old
 d. Louise, who is 14 years old

[xMRAZ]

Answer to Question 1

a

Answer to Question 2

c

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Wow, this really help

[brbarasa]

Great answer, keep it coming