Bubonic plaque is a resultant of Yersinia pestis, that is, a bacillus form of bacteria. The bacterium is witnessed primarily in rodents and in their fleas. This bacteria gets transmitted via the bites of infected rodents and the fleas.
At the end of the 19th century, Alexander Yersin, a French biologist discovered Yersinia pestis. It was the cause of the disease known as the black death. Later, with the study of nematodes, the genes that played the role in the transmission of the disease was identified. Other than this, the microbiologists came to know that the bacillus is transmitted from an individual to individual via the air, and through the bites from infected rats and fleas.
On the basis of biologist Simond, the bacteria obstruct the digestive tracts of the fleas and instigate them to repeatedly bites its prey, thus, injecting and dispersing the bacteria. The bacteria attacks on the lymph nodes immune cells, and thus, the infection starts and gets transmitted to others as well.
Answer:
I believe the answer to this question is “expectorants”.
I hope this helps.
Answer:
Allopatric speciation occur due to various environmental factors with in the environment.
Explanation:
Speciation occur when two population become so genetically different and the can not interbred to produce fertile off spring. The allopatric speciation occur when population become sepret and diverge over time due to natural selection,genetic drift,and mutation.Genetic drift is the sudden loss of gene from a population which cause the population evolvation. Mutation is also change in the genetic makeup of an individual.Natural selection is the phenomena selected by nature and natural forces are involve to select the trait in a living organism.
First the question is asking If a descision was made to drain the wetlands which a wetlands is haves rich soil and nutrients which is good for farming and an agricultural action means someone would clear out a forest of farming reasons so I would say the answer is A
