Q. Which of the following statements is true?
A) All living members of class-Cyclostomata are parasites on some fishes
B) There are about 25,000 species in the class-Osteichthyes
C) Ciona belongs to the sub-phylum-Cephalocohordata
D) Arthropods are diploblastic animals
Explanation
‘Pisces’ is the largest class of vertebrates in number of species. There are about 40,000 species in super class-Pisces including about 25,000 species of the class-Osteichthyes (the freshwater and marine bony fishes).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.