What explanations do these documents offer for the onset of plague? what do they suggest about the extent of europeans understanding of the disease and how it spread?

.

Explanation:

These documents offer the precautions and rules that were set in place to hinder the number of casualties, it was to take control and keep people from spreading the plague. When the Plague originally started to spread, people in Pistoia were not able to leave the city and no one was allowed back in. This was to help maintain the spreading of the disease and protect the few people alive in the city. The Tartars took over a Christian village and the onset of plague overruled the Tartars. The understanding of the disease process was that it spreads fast, viciously and it kills a lot of people unwillingly.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

age range would be the answer