question_answer

The figures (P-S) show four animals. Select the correct option with respect to a common characteristic of two of these animals.

A)  Regeneration is best observed in 'P' and 'S'.

B)  'Q' and 'R' have well developed photoreceptors.

C)  'R' and 'S' have nematoblasts for offence and defense.  

D)  'P' and 'Q' exhibit polymorphism.