Freshwater ecosystems that often originate from underground sources in mountains or hills are a estuaries. b rivers and streams. c lakes and ponds. d wetlands.

Option B, rivers and streams

Explanation:

Lakes and ponds are water bodies that hold water with in them and remain stagnant. The major source of water for these water bodies is rainfall.

Wetlands are forest areas that have water quantity enough to surpass the absorption capacity of soil thereby causing water logging.

Estuaries are areas lying just before the convergence of fresh water bodies into the ocean.

hence, the correct option is B

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.

yes? sounds right, but you didn’t ask a question.