I think it's C i'm sorry if i'm wrong.
Answer:
The cities have a much larger populations in smaller areas, which can cause more crime and overcrowding, along with pollution.
because they have many population and many other countries visited the singapore because of the environment, beautiful place and etc..
A mineral is a naturally occurring,inorganic, crystalline substance that aggregate to form rocks. Geologists separate minerals into classes based on their chemical composition. The different classes of minerals include halides, oxides, phosphates and sillicates. Rocks are usually classified based on the grouping and composition of minerals in rocks.
