Fruit flies are commonly used in genetic investigations that focus on traits passed from parents to offspring over several generations what can you infer is the reason fruit flies are the most commonly use organism for this type of investigation a- many more generic sins can be studied using short-lived organisms b- scientist prefer to study what has previously been studied c- society does not have ethical issue with lab kept fruit flies d- fruit flies are relatively inexpensive

A is the answer ,how this helped.

A- many more generic sins can be studied using short-lived organisms.

Explanation:

Fruit flies, Drosophila melanogaster, are preferred organisms for genetic studies. Drosophila melanogaster has a short generation time, reproduces and survives well in laboratory conditions.  

Its generation time is about two weeks. So, Drosophila melanogaster can produce large number of progeny in relatively short time. Due to its short generation time, scientists can study inheritance of particular genetic trait in many generations during a short time span.

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy