When a child can simultaneously manipulate two dimensions cognitively, such as circumference and thickness, sothat s/he understands that a change in one dimension is compensated for by a change in the other, s/he understands 

When thinking about possibilities that may or may not reflect reality, an adolescent is now using ______ thought

Fill in the blank with correct word

Statistically speaking, AIDS CANNOT be transmitted by:

a. sharing needles. b. exchange of semen. c. kissing. d. direct contact with the blood of an infected person.