Figure 2. The distribution of non-essential, essential and conditionally-essential/non-essential reactions versus environmental diversity across the 487 organisms studied.
Lines represent the linear regression calculated for each group.
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.