"Entrance here," one of the soldiers called, looking up from the subsurface monitoring device in his hand. [Please select]
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In summer, these streams may become intermittent, but springs and subsurface percolation maintain pool-levels (Minckley and Cross, _loc.) [Please select]
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In some eggs a few faint clouds or small spots of subsurface-looking dusky purple may be noticed mingled with the rest of the markings. [Please select]
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Reduction of these organs in Urodela may be correlated with their customary restriction to subsurface habitats and inability to maintain a floating position while in water. [Please select]
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