Compensation depth is always below the . a. depth of light penetration
b. depth of greatest productivity
c. aphotic zone
d. intermediate bottom waters
e. oxygen minimum zone

answer; ///(b) it is composed of four protein chains and four heme groups;

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

not: both offer magnification to the atomic level.