Read the following statements and find out the incorrect statement.

Options

A. Animals belonging to phylum chordata are fundamentally characterised by the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gills slits.
B. In echinoderms, larva is free-swimming
C. In non-chordates, central nervous system is ventral, solid and double.
D. In non-chordates, gill slis, post-anal tail, heart and notochord all are absent.

Answer

D

Explanation

In non-chordates, gill slits, post-anal tail, heart and notochord all are absent, heart may be present.