Which body structures have walls one cell thick

When elements that form a mineral dissolve in hot water, they form a mixture called a(n) a)geode b)vein c)evaporation d)crystallization e)magma f)lava g)solution h)gem

Collin would like to use the data a coworker has entered in a database. the problem is the coworker's database software is different from collin's. collin should

Where is pericardial fulid located