Find the odd example.

Closed circulatory system is present in

Prepare a list of some animals that are found parasitic on human beings.

Match the following animals with their respective phyla and arrange them in the correct order as per the given list of animals: Animals: $Leucosolenia$,$Opalina$,$Planaria$,$Wuchereria$. Phyla: $Aschelminthes$,$Protozoa$,$Porifera$,$Platyhelminthes$.

Which of the following organisms exhibit either internal or external fertilization?

Give the names of the following:
$(a)$ $A$ limbless animal
$(b)$ $A$ cold-blooded animal
$(c)$ $A$ warm-blooded animal
$(d)$ An animal possessing dry and cornified skin
$(e)$ An animal having a canal system and spicules
$(f)$ An animal with cnidoblasts