The frequency of the sickle cell allele in areas where malaria is introduced will increase and it will be advantageous.
When a person is heterozygous for sickle cell anemia, it means it has one abnormal allele of the hemoglobin beta gene but doesn’t express the disease (like homozygous person).
On the other hand, a person heterozygotes for sickle-cell trait has a selective advantage in environments where malaria is present.
Since they are reduced it requires less water to stay alive and healthy. and the big stem with a spacious interior is to store maximum amounts of water because of how little precipitation the deserts get
Answer:
Deforestation would be your answer.
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