What happens to the mRNA before it comes to the ribosome?

Explanation: RNA is made in the nucleus.  It is a single stranded copy of DNA.  It gets edited by removing the introns (non coding region) and  keeping the exons (coding region).  The mRNA now leaves the nucleus to be read by the ribosomes.  

and after water is usually warmed by the sun the water temperature raises and then evaporates .

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.