Eggs are produced in the lower one, the ovary, and sperm cells in the upper one, the spermary. [Please select]
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The one nearer to the mouth end is the spermary and that near the attached end is the ovary. [Please select]
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In the cells of the spermary the spermatozoa are closely packed together, with their heads pointing outwards towards the summit of the mound through which they finally make their way into the water. [Please select]
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