The large increase in vocabulary in middle childhood occurs for _________________, which involve adding a prefix or suffix to a root word

Worldwide, the main route of transmission for HIV is

A) heterosexual sex. B) through blood and blood products. C) child birth. D) homosexual sex.

Cigarettes are to smoking as

a) snuff is to snuffing b) cigars are to tobacco leaves. c) tobacco is to nicotine. d) pipes are to cigars.