overcrowded world

Some developing countries should improve the education and _________ .

Give one suitable ADJ to describe her ?

there is not enough of something?

Many children in Africa have to face _________.

a very poor and crowded area, especially of a city ?

a lack of something or when the quality of something is extremely low?

useful, important, or good enough to be a suitable reward for the money or time spent or the effort made?

a group of people, animals or plants that live or grow together

what is this phenomena?

This apartment is so ________.

having parts that are close together so that it is difficult to go or see through?

_________ is one of the factors which has effect on nation's economy.