(a) The blastopore develops into anus in adult
(b) The blastopore develops into mouth in adult
(c) Cleavage is radial and indeterminate
(d) Cleavage is spiral and determinate
$\begin {array} {1 1} (1)\;(a) \:and \:(c) & \quad (2)\;(a)\: and \: (b) \\ (3)\;(b) \: and\: (d) & \quad (4)\;(b) \: and \: (c) \end {array}$
