Simplify the following text for a Grade 10 native English-speaking person.
Original: In cephalopods the contraction of the mantle is used to force water through a tubular siphon , the hyponome , and this propels the animal very rapidly through the water .
Simplified: In cephalopods the contraction of the mantle is used to force water through a tubular siphon , and this propels the animal rapidly through the water .