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professor190 [17]
3 years ago
15

Sickle cell anemia is a disorder common in the sub-Saharan region of Africa. Although sickle cell anemia is generally fatal, hav

ing one allele for the disorder is also known to make a person resistant to malaria. Research shows that in the areas where malaria is most common, the sickle cell trait is seen in more than 40% of the total population.
A bioaccumulation
B geographic isolation
C interbreeding
D natural selection
Biology
1 answer:
Anna11 [10]3 years ago
7 0

the answer to this question is d

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Theories are a collection of scientific data that is generally accepted and reproducible. Theories are a result from several repeated experiments, but theories are not based on a single hypothesis. Several hypotheses are tested and appraised to become a well accepted theory. Theories may also be revised over time and can predict what may happen in the future. On the other hand, theories are not proven facts.
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The muscles of the digestive tract are called smooth cardiac muscles? true or false
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Answer:Smooth muscle or “involuntary muscle” consists of spindle shaped muscle cells found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, ureters, bladder, and blood vessels.

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The correct answer is : parasitism.

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