Parents who set clear, firm, and consistent limits for their adolescent children are best described as ________ parents

The vomeronasal organs, located in the noses of most mammals, are specifically designed to be receptive to __________

a. edible foods b. perspiration c. natural gas d. pheromones

The use of ______ can be traced back to 4000 B.C. in ancient Sumeria, where it was referred to as the "joy plant."

a. cocaine c. marijuana b. opium d. nicotine