I believe the anwser you are looking for is the
Cell Membrane.
It is a substance that lets things in and out of the cell
B. liquid! Becuase its Seperational atoms have a Huge Attraction within Heated Atoms..from the Sunlight It then sweats..It starts too Evaperate then later by time it Rains.. Etc "Water Cycle" correct me if im Wrong..
The B.genetic diversity because, variation is diversity so it would be between b and d but genotype has to deal with the genetic code leaving B.
A.) water is polar, but lipids are nonpolar
C) His work proving that unseen bacteria can cause disease.
