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.
Diagram of the basic elements of the chordate body plan, featuring a tadpole-like animal with a fibrous notochord (N) and a hollow neural tube (NT) in the dorsal side (cavitation is shown in dark green), a muscular tail (MU) for swimming, and gill slits (GS, a character shared with other deuterostomes). A, anus; H, heart; M, mouth.
