Which factors are necessary for an organism to become a fossil?

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?

What kinds of molecules can pass through the cell membrane without any problem?

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.