What is common between $Ascaris$ $lumbricoides$ and $Anopheles$ $stephensi$?

Which of the following differences between Chondrichthyes (cartilaginous fishes) and Osteichthyes (bony fishes) is incorrect?

In which phyla is radial symmetry observed?

Identify the mismatched pair from the following:

Select the correct option for the labeled part $X$ and $Y$ from the given diagram.

Which of the following statements are true/false?
$(i)$ In $Torpedo$,the electric organs are capable of generating strong electric shock to paralyze the prey.
$(ii)$ Bony fishes use pectoral,pelvic,dorsal,anal,and caudal fins in swimming.
$(iii)$ Amphibian skin is moist and has thick scales.
$(iv)$ Birds are poikilothermic animals.
$(v)$ The most unique mammalian characteristic is the presence of milk-producing mammary glands by which the young ones are nourished.