(C) In spiral cleavage,the orientation of the blastomeres can vary. When the turn of the spiral is clockwise,it is termed as $dextral$. When the turn

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(C) In spiral cleavage,the orientation of the blastomeres can vary. When the turn of the spiral is clockwise,it is termed as $dextral$. When the turn of the spiral is anticlockwise,it is termed as $sinistral$. Therefore,both clockwise and anticlockwise turns are possible in spiral cleavage.