Nephridia always paired, rarely (Pontobdella) forming a network communicating from segment to segment; lumen of nephridia always intracellular, funnels pervious or impervious. [Please select]
0
Now, the alum is pervious to all the luminous rays; hence it cannot be these rays that caused the boiling. [Please select]
0
A coarse, half-worn cloth, that is pervious to the air, like a wire sieve, and perfectly dry and clean, forms the best wrapper. [Please select]
Do you have a better example in your mind? Please submit your sentence!