Answer:
Between 1830 and 1850, immigrants who moved to American cities often faced crowded living conditions in poor neighborhoods. The Industrial Revolution opened many new job opportunities for people. Americans that lived in the rural areas of the country moved to the larger cities where the factories were located.
Pollution from factory discharges and waste dumping. Also biodiversity from deforestation and other natural habitat losses
<span>Although China's agricultural output is the largest in the world, only about 15% of its total land area can be cultivated. China's arable land, which represents 10% of the total arable land in the world, supports over 20% of the world's population. </span>
Some Challenges in the tropical rainforest is that Deforestation is common and its really bad because they're limiting the rainforest size just to build homes and towns. Basically, Just forgetting about the habitats and the animals and the other tribes.
The answer is a) they are all big
b) latitude and longitude
c)