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Vesna [10]
3 years ago
7

It is thought that in Europe, the influenza virus changed in such a way to make it more virulent in the human population, result

ing in increased severity of disease and increased mortality. What changes could have led to the differences in pathology observed in Camp Funston and in Europe?
Biology
1 answer:
dsp733 years ago
6 0

Answer:

These changes probably would have taken place because of antigenic shift or to a smaller extent because of antigenic drift. The antigenic shift takes place when the segments of the influenza viral genome recombine in various ways, and this leads to major modifications to the proteins present on the surface.  

The individuals generally do not possess immunological memory to this novel strain of the virus, thus, the disease that they encounter can be more extreme in comparison to the infection with strains to which they possess certain immunological memory. The antigenic shift can result in influenza pandemics.  

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The renewal of a forest after a fire: The fire itself destroys a majority of different types of trees and plant life. Because seeds and roots and other plant and tree parts remain in and on the soil, gradually the plants and trees begin to grow again and eventually returns to the state of the original ecosystem.

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On the island of Lawahii, several centuries ago, a fire erupted that caused the destruction of all plants and vegetation. Many years later, the plants and vegetation had grown back in, as the nutrients, seeds and soil remained.

Renewal after disease: A plant population can be very negatively affected by a variety of infectious plant diseases. If the entire population dies, but the soil and roots remain, it is possible for secondary succession to occur and for the population of those plants to to return.

A flood can ruin farmlands. However, because the soil remains after the waters recede, over the course of many years a natural secondary succession can occur and the vegetation that had previously grown there can grow again.

Plants can be very susceptible to attack from pests, particularly if there is an overpopulation of those pests. When this occurs, the plant population in one area can be completely destroyed. However, when the pest overpopulation is resolved, the plants are able to live again and thrive in the soil in which they previously had lived.

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And also human activities can harm the environment and cause secondary secession.

Explanation:

because it’s true. source: https://examples.yourdictionary.com/examples-of-secondary-succession.html

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