The reason why one case of influenza does not confer lifelong immunity is that the virus tends to mutate overtime which makes it unrecognizable to the immune system.
<h3>Why is it difficult to get immunity to influenza?</h3>
Influenza is caused by a virus which tends to mutate overtime in order to stay ahead of medical technology.
As a result, this mutation makes the original virus unrecognizable to the immune system which would then be unable to fight it.
Find out more on natural immunity at brainly.com/question/21480961
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Scarcity refers to the basic economic problem, the gap between limited – that is, scarce – resources and theoretically limitless wants. This situation requires people to make decisions about how to allocate resources efficiently, in order to satisfy basic needs and as many additional wants as possible.
Scarcity dictates that economic decisions must be made regularly in order to manage the availability of resources to meet human needs. Some examples of scarcity include: The gasoline shortage in the 1970's. Coal is used to create energy; the limited amount of this resource that can be mined is an example of scarcity.
Scarcity is simply the concept that human wants (not human needs) exceed the resources available that are necessary to produce the goods used to satisfy those wants. Since economics is the study of how people make choices, without scarcity there would exist no choice and, hence, no economics.
Hope this helps:)
I believe the answer is: Glaucoma
Glaucoma is a form of physical disorder that caused by <span> elevated intraocular pressure that damage the optic nerves.
This causes many of people in older generation to dramatically lose the quality of their vision, in some cases it may resulted in Blindness.</span>
Answer:
this is because answering a text makes us unfocused on the road and takes out attention for a short time , even seemingly minor use such as clicking a button can result to a catastrophe. drivers can only safely take their eyes away from the road for max 2 sec without risking a crash
