Which of the following shows polymorphism?
a)	Physalia	b)	Trypanosoma	c)	Termite	d)	All of these

(a)

The colony of Physalia is a massive type colony, containing many zooids. Among the zooids, a large cup-shaped float is seen, which is bright blue in colour and remains above the sea water normally.  On the undersurface of float many gastrozooids, gonozooids and dactylozooids are present. The colony, thus, shows a very high degree of polymorphism (i.e., existence of two distinctly different forms in a species).