We learned about many different animal phyla. How do scientists classify animals to determinewhich phyla they belong to?

a. Adult Body Plan

b. Embryological Development

c. Animal Body Sized.

d. Both a and b are correct

2 answers

Since Jiskha doesn't have a biology expert at this time, please try posting your question at this site.

http://www.biology-online.org/biology-forum/

In addition, be sure to make really good use of KhanAcademy!
http://www.khanacademy.org/science/biology
Choose from the general topics at the right and then find the specifics you need within each topic.
both a and b