Lipids don't dissolve in water because of the different polarities. Water is polar and lipids are not polar which is why they don't dissolve. What this means is that they don't bond and don't share electrons and therefore don't mix.
The answer would be white dwarf
I'm going to go with A. This is because the population of frogs is definitely decreasing, as they are loosing food. Also, the frogs are prey for the snakes, and if there are no frogs for the snakes to eat, the population of snakes can go down, too.
Hope this helps!
