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 these synonyms: 1  keep, maintain, hold(verb) keep in a certain state, position, or activity; e.g., keep clean. Synonyms: 2  conserve, preserve, maintain, keep up(verb) keep in safety and protect from harm, decay, loss, or destruction. Synonyms: 3  sustain, keep, maintain(verb) supply with necessities and support.