What is the purpose of using a pedigree?

The pedigree chart are used to check the mode of inheritance of certain trait.  

Explanation:

The pedigree is used to know the probability of the offspring getting a particular disorder or condition. It also help to discover the location of the defected gene. And through it can also be predicted that weather it will be a dominant or a recessive trait. For this pedigree data of several generations are required. Here, the phenotype ratios of the offspring can be accurately determined only when the genotypes of the parents are known.

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.

the answer is c.) there is a warm front in region a and a stationary front in region b.