300 million years ago, Wisconsin was once covered with rock, while West Virginia was covered with swamps. Why do you think West Virginia today
produces a lot of gas and oil, while Wisconsin does not?

Because West Virginia had more density of organic materials back in that time.

Explanation:

This is because gas and oil is produced by the decomposition of organic materials.

As virginia was covered with swamps, under the actual surface we can find a lot of organic material (the remains of the swamps and such) while in Winsconsin, under the surface there are mostly rock, so there is not a lot of organic material that can be descomposed to produce oil or gas.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

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.