) Explain why many Jews living in the Warsaw Ghetto starved to death?

The living conditions in the ghetto were very difficult. Density of population was extreme, there were 146,000 people per square kilometre which meant 8 to 10 people per room on average. Jews from other districts of Warsaw as well as those from other cities were allowed to bring only the absolute minimum with them – usually personal belongings and bedclothes. That meant instant poverty and great social disadvantage in comparison with original inhabitants of the ghetto's pre-war district. But in general only a very small percentage of the ghetto population had any kind of regular employment or any other source of income. Street trading became a necessity for many and anything could be a subject of exchange.

Explanation:

The results were truly horrific – between October 1940 and July 1942 around 92,000 of Jewish residents of the ghetto died of starvation, diseases and cold which accounted for nearly 20% of the entire population. The dreadful conditions in the ghetto forced many Jews to escape.

the answer is "by providing data about careers and annual mean wages"

the answer is 1.. i think