Echidna and platypus lay eggs but are considered as mammals. Why?
Though I am multicellular, there are no tissues in my body. What is the name of my phylum?
21/30 Respiratory organs in aquatic arthropods like cary fish,prawns and molluscus like Unio are
Fertisation of Phylum Coelenterata?
Charecters of a phylum are given below. Read those carefully and name the phylum.
a. Spines of calcium carbonate are present on the body.
b. These animals are exclusively marine.
c. They perform the locomotion with the help of tube feet.
d. Their skeleton is mode up of calcareous plates or spicules.