Average lifespan of a person?

Does mitochondria still meet the definition of a eukaryote why or why not?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

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