26. The significance of the Lincoln-Douglas debates was that (a) Douglas failed to be reelected Senator (b) the Missouri compromise was repealed (c) Lincoln supported the doctrine of popular sovereignty (d) Douglas lost the support of the South for the Presidency

I think it's D

Explanation:

The Lincoln-Douglas debates were presidential debates so the only answer that related to becoming president is D

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )