Question

During embryonic development, if the anus develops before the mouth, the organism is a _____.

Answer 1

deuterostome

Answer 2

Deuterostomes means "second mouth") are a superphylum of animals. They are a subtaxon of the Bilateria branch of the subregnum Eumetazoa, and are opposed to the protostomes. Deuterostomes are distinguished by their embryonic development; in deuterostomes, the first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth. Deuterostomes are also known as enterocoelomates because their coelom develops through enterocoely.
for further more: http://en.wikipedia.org/wiki/Deuterostome

Answer 3

thanks C:

Answer 4

you're welcome :)