Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Most have cells that are not able to exchange gases with the outside environment do multicellular organisms need transport systems.
Why do multicellular organisms need transport systems?

The frequency of a wave is the reciprocal of the period of the wave.
The frequency of a wave is the reciprocal of what other attribute of the wave?

Temperature is too cold is there very little evaporation in the boreal forests.
Why is there very little evaporation in the boreal forests?