I am pretty sure it is A because you could use a test tube or beaker filled with water and turn it upside down in another container filled with water and then use a hose or something to let the gas into the test tube to displace the water.You can't have use a gas that is soluble in water. am pretty sure it is A because you could use a test tube or beaker filled with water and turn it upside down in another container filled with water and then use a hose or something to let the gas into the test tube to displace the water.
verb (used with object), preserved, preserving. 1. to keep alive or in existence; make lasting: to preserve our liberties as free citizens. 2. to keep safe from harm or injury; protect or spare. 3. to keep up; maintain: to preserve historical monuments.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  continue, uphold, carry on, bear on, preserve(verb) keep or maintain in unaltered condition; cause to remain or last. 2  uphold(verb) stand up for; stick up for; of causes, principles, or ideals. 3  uphold, maintain(verb) support against an opponent.