How many times do cells divide during meiosis

In what for do plants utilize nitrogen? why do they need nitrogen?

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

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2