How are the probabilities of two parents creating offspring expressing certain traits calculated ?

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?