What does "the fittest" mean in an evolutionary sense?

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

What form of anesthetic was used for field surgery

If the dimensions of a cube-shaped cell with a length,height, and width of 1 micrometer were to double, what would be the cell's new ratio of surface area to volume? a.3 to 1 b.4 to 3 c.1 to 2 d1 to 6