Which is an example of a trace fossil?

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.