Sickle-cell disease is common in tropical and sub-tropical regions because being a carrier, carrying a single sickle-cell mutation (sickle cell trait), affords some resistance to malaria.
Answer:
b. testing new conditions.......
Answer:
Bicuspid aortic valve is a type of abnormality in the aortic valve in the heart. In bicuspid aortic valve, the valve has only two small parts, called leaflets, instead of the normal three. This condition is present from birth. It can occur with other heart defects. The heart's ventricles are the two lower chambers of the heart.
location :
Bicuspid valve is one of the four valves of the heart which is situated between the left atrium and the left ventricle. Tricuspid valve is one of the four valves of the heart which is situated between the right atrium and the right ventricle. Bicuspid valve is present in between the left atrium and the left ventricle.
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Nucleus is the cell part that contains an organism's genome.
Answer:
I'm pretty sure the answer is A
