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.
The small white ball in each box represents the mean of the heat tolerance of the whole population. Different letters above the boxes represent a significant difference in heat tolerance between populations.
