The carbon footprint of an activity is used to assess environmental pollution. what does it measure?

Describe two recent or ongoing space missions.

About how much of the cell mass is watet

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