Why the execvp system call work with addresses

Why does the execvp system call work with addresses (or pointers)?
How does execvp system call determine when the array of command-line arguments (i.e., the 2nd argument to execvp) have ended?
How does the OS determine the characters constituting a given command-line argument?
The execvp syscall can be a bit tricky to work with. Hence, we will use a helper method. What was the signature (name and parameters) of the helper method that was suggested to ease using the execvp system call. What was the caution discussed about the helper method?

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dimensions of human development: a long and healthy life, access to knowledge and a decent standard of living. China’s HDI value is 0.752 (2017), which puts the country in the high human development category at 86 out of 189 countries and territories, shared with Ecuador. Between 1990 and 2017, China’s HDI value increased from 0.502 to 0.752, an increase of 49.7%. Between 1990 and 2017, China’s life expectancy at birth increased by 7.1 years, mean years of schooling increased by 3.0 years and expected years of schooling increased by 5.0 years. China’s Gross National Income (GNI) per capita increased by about 898.7% between 1990 and 2017. In China, the central government has overall responsibility for national health legislation, policy, and administration. It is guided by the principle that every citizen is entitled to receive basic health-care services, with local governments (provinces, prefectures, cities, counties, and towns) responsible for providing them. Health insurance is also publicly provided and financed by local governments, therefore local governments play a major role in keeping the HDI value of China high by keeping facilities available to members of the local communities and their families. In addition, the Chinese deputy director general of basic education, Wang Dinghua stated: “We need to shift from a nation with large human resources to a nation with strong human resources.” To achieve that, China is doing more than just talking. It is working to implement a plan that it hopes will significantly improve its education. At the moment, China has an incredibly high internal immigration rate. It is seeing a mass migration of more than 300 million people leaving their homes in rural China to go to the country’s cities. Consequently, a large amount of government money goes to expanding urban centres and updating infrastructure to accommodate the booming population, therefore however, causing worry that there will be little to no space left for incoming stu

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