Through diffusion is the answer
A river that comes from rain, glaicers etc would be a good example of fresh water rivers. Cause the water is coming from something that is most likely been unthouched by man or has been filterd and cleaned from minerals in the ground.
The sun provides all the energy for evaporation.
The answer is hydrogen bond between the complementary strands.
Because the common cold is cause by a ‘virus’.......
The answer is VIRUS
