The fact that motor skills are greatly affected by __________ ...

[jace]

The fact that motor skills are greatly affected by __________ lowers the validity of tests of these
  abilities.
 
  A) heredity B) intelligence C) practice D) faking

Question 2

Extensive investigations of the relationships of scores on intelligence tests to degree of kinship
  have found the highest correlation between the IQs of
 
  A) fraternal twins reared apart. B) identical twins reared together.
  C) fraternal twins reared together. D) identical twins reared apart.

[phuda]

Answer to Question 1

C

Answer to Question 2

B