Question

Which of the following features do the nervous systems of a hydra, a flatwrom, and a fish have in common?

A.
They all contain nerve cells.

B.
They all contain ganglia.

C.
They all control behavior of the animal.

D.
They all have brains.

Answer 1

and explaine why please!

Answer 2

@ganeshie8

Answer 3

@Nurali

Answer 4

@perl

Answer 5

PLEASSSEEE

Answer 6

@arabpride

Answer 7

PLEASE NURALI

Answer 8

Any ideas?

Answer 9

Hydra: http://www.transtutors.com/biology-homework-help/hydra/nervous-system/
Flatworm: http://cnx.org/resources/893c08ad064d3556114811e20336e1b6/Figure_15_03_01.jpg
Fish: http://www.potosisd.k12.wi.us/staff/hutchcroft/Biology%20Notes/Power%20Presentations-Biology/assets/Transparencies/Bony-Fish-Anatomy.gif