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.
When you preserve something, you maintain its condition, like trying to preserve your good health by exercising regularly and eating right. The verb preserve describes keeping something as it is now, without a decline in quality. It can also refer to keeping something safe from harm, as in âThe group worked hard to preserve the regional ecosystem.â When you preserve food, such as fruit, you keep it from rotting. Jellies and jams are preserves, the noun form.