Although the structures of the functional groups important to life vary in chemical structure, they share one thing in common: [[just type the answer not the letter]]
a) all contain oxygen
b) all have at least one double bond
c) cause the carbon to which they are attached to become an asymmetric carbon, and they convert the molecule into an isomer
d) unite the skeleton into a closed ring
e) are all hydrophilic and increase the organic compound's water solubility