What are the rounded hills inside the valles caldera?

How do you transfer mrna into codons ? i'm so confused : (

Plants that have reproductive structures called cones are?

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