Answer:
The most likely cause of this disease is that siblings have a variable expression of this disease.
Explanation:
Neurofibromatosis 1 is an autosomal dominant disorder, even though it is a very rare disease to occur. This dominant nature causes this disease to be expressed even in people who have heterozygous alleles for it, which makes it easier for siblings to have this disorder, since only those who are hom0zygous recessive would not present it. However, the expressiveness of the disease may vary between siblings, as is the case shown above, where although the two siblings have the same disease, they present it in different ways.
The correct choices in the questions above is the third choice, where it meets a social need and improve the economy. It is because when they spend money in education, it reaches and meets the social need of the persons who are not capable of studying because of their lacking and it also improves economy because when students graduate, they could enter jobs where they could help rise and improve the economy in the country.
Charles Martel the answer is charles martel
