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.
Time scale panel generated by the TimeTree-the time scale of life web-database. The time scale panel displays the divergence of geological time scale, earth impacts, levels of oxygen, carbon dioxide and solar luminosity. Time divergence between all the selected taxa except for F. radiculosa is displayed above the time scale panel.
