What is the feature numbered 2 on this photograph? 
Definitions:
Hydrophilic Molecules
Molecules that are attracted to water and can dissolve in it easily, due to their polar nature.
Plasma Membrane
A semipermeable lipid bilayer that surrounds the cytoplasm of cells, controlling the movement of substances in and out of the cell.
Membrane Potential
A difference in electric charge between the two sides of a membrane.
Membranes
Thin layers of tissue that cover surfaces, lines cavities, and separates or connects spaces or organs in a living organism.
Q1: A primary market is any financial market
Q19: Factors that affect the appearance of a
Q20: An example of an economy that had
Q29: Which of the following typically decreases downstream
Q56: Which of the features on this aerial
Q61: Which of the labels in the map
Q62: Savings by _ is the origin of
Q62: Which of the following does not belong?<br>A)Stable
Q66: Which state would most likely have the
Q66: Biomagnification can directly cause<br>A)increases in the amount