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.
(A) In a low-resolution growth series, multiple individuals are grouped into vague sets. (B) In a high-resolution growth series, each growth stage only has a single individual.
