Some scientists believe that sickle-cell anemia is a beneficial mutation because it:

increases life expectancy
provides immunity to diseases
increases resistance to malaria
adds new information to dna

increases resistance to malaria

Explanation:

Sickle cell anemia is a genetic disorder in which the shape of red blood cells changes from oval to that of sickle. Because of this change in shape, the red blood cells  tend to get stuck in the blood vessels and block them. Apart from this, the life span of sickle shaped red blood cells shortens leading to anemia. But, having sickle cells is advantageous too. Those people who have this disease can never acquire malaria. The parasite known as plasmodium which causes malaria can not infect sickle shaped hemoglobin that is why people having this disease are resistant against malarial infection.

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explanation:

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earthquakes in florida are rare because the state is not located near any tectonic plates. in fact, florida is tied for first place as having the fewest earthquakes of any state. much of florida is limestone and seafloor materials that is not conducive to earthquakes.

explanation: