- Portion;of the body-wall of Hydra, showing ectoderm cells above, separated by " structureless lamella " from three flagellate endoderm cells below. [Please select]
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After a while their movements ceased, they contracted into a ball, and again secreted round themselves a clear structureless envelope. [Please select]
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But how can two structureless things interact so as to produce a structure. [Please select]
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Preconceived ideas prejudiced the observers, and their sketches were mostly structureless. [Please select]
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