Alandfill with a plastic or clay liner that prevents the leaking of waste into soil and groundwater is called a. a recycling center b. an unsanitary landfill c. a sanitary landfill d. a toxic waste site

The current thought on the structure of the cell membrane is: a. a static phosphate sandwich of lipids b. a fluid-mosaic of phospholipids and proteins c. a bilayer of proteins with static lipid molecules d. an impermeable bilayer of protein molecules e. a static and permeable phospholipid single layer