Practice:Zooology

=new subject to learn=
 * 1) how to distintguish between invertebrate and vertebrate
 * 2) what are the different phyla of invertebrates
 * porifera
 * coelentrata
 * helminthes etc.
 * 1) what are the different classes of vertebrates
 * pisces
 * amphibia
 * reptilia etc.