The convection shown in the diagram is powered by heat from which part of the the Earth? core, crust, ocean, sun.

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

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

How energy move through ecosystem ?