Explain Anaemia More Condition_symptoms How Can Sickle Cell Anaemia Be Described In Terms Of Natural Selection?

How can sickle cell anaemia be described in terms of natural selection? - explain anaemia more condition_symptoms

... and how this link for malaria?

[Sickle cell anemia train is a situation where the presence of a recessive allele coding for hemoglobin, a substance in the blood, which occurs for the transport of gases such as oxygen. The presence of the recessive allele is partially expressed (cell), or fully by an expression that produces anemia recessive expressed complete Full Blown. If this allele is dominant, there is no train in sickle cell anemia phenotype expressed.

A link is justified, in Africa, noting that those who suffer from sickle cell anemia or have been immunized against the effects of malaria. Although sickle cell anemia or not advantageous features of their own, they prove to be useful in areas where malaria is a major threat to the conservation of the genome (ie, they outlive shown).]

Can you explain in simple words, please? I find it hard to understand.

Thank you.