Answer:
B) The inhibition of normal myelin development in the individual's brain
Explanation:
Phenylketonuria is a disorder characterized by abnormal levels of phenylalanine in the body. It is <u>caused by mutation in DNA that leads to the deficiency of an enzyme known as phenylalanine hydroxylase, which converts phenylalanine to tyrosine</u>, a fundamental substance for dopamine production - related to working memory.
Some of the symptoms of this disorder is intellectual disability, which is caused mainly by demyelination or defective myelin biosynthesis, leading to the <u>inhibition of myelin, a fatty insulating sheath that protects nerves</u>.
Therefore, the cause of the intellectual disability in the individual is <u>the inhibition of normal myelin development in the individual's brain.</u>
Answer:
Urban development can magnify the risk of environmental hazards such as flash flooding. Pollution and physical barriers to root growth promote loss of urban tree cover. Animal populations are inhibited by toxic substances, vehicles, and the loss of habitat and food sources
Answer:
The correct option is : d. is a matter of inequality and beliefs about why people should be unequal.
Explanation:
Social stratification is defined as a system of social ranking in a society. In this system, the people are categorized in groups and ranked on the basis of their socioeconomic status.
The four principles of social stratification are:
1. It reflects the differences between the various groups in a society. It does not reflect the differences between individuals.
2. It is present in every society but varies from place to place.
3. It gets carried on to the next generations.
4. It includes inequality and difference in the beliefs between the various groups of the society.
