Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Diagram of the place-preference test tank (30.5 cm × 15.2 cm × 15.2 cm) divided internally into 3 vertical compartments using 2 black lines drawn on the tank exterior. Water level is indicated in blue. One compartment contained a 17-cm artificial plant. The other compartment contained 3 mixed-sex, age-matched conspecifics.
