Preschool boys . a. engage in more rough-and-tumble play and are more aggressive than girls. b. show somewhat lesser visual-spatial ability than girls.

engage in more rough-and-tumble play and are more aggressive than girls

Explanation: In general, boys engage in more rough-and-tumble play than girls and this starts from preschool age. For this reason, boys may prefer playing with other boys or their fathers when it comes to choosing between their parents. Aggression at this age does not necessarily continue when they are older and starts decreasing between age 2-3.

When this does not change as they grow older, it may develop into social problems. There are studies that show that rough-and-tumble play between children and their parents can help control aggression in children as they grow older such that it does not become pathological.

the answer would be in this answer. someone already asked the question.  

answer; earthquake;