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.
Green circles—tropical rainforest (warm and wet site); red squares—tropical woodland (warm and dry site); blue triangles—temperate forest (cool and wet site). *** P < 0.001.
