There are four stages to the classical demographic transition model. pre-transitional europe was characterized by high and fluctuating mortality and a high birth rate. the transition model began to progress into and through stage 2 in the late 18th and early 19th century. all but one contributed to the decline in mortality. a) enacting measures to provide clean water supplies. b) public health advances including quarantine of settlements undergoing epidemics. c) the development of vaccines to prevent disease and antibiotics to treat infection. d) widespread acceptance of germ theory resulting in more hygienic practices, including hand washing and sterilizing medical equipment and infants’ bottles.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.

b. to discover aspects of the natural world.

hopefully i .