What body system is the human heart part of?

Chicken pox and hepatitis are bacterial diseases. true or false?

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

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