During which phase of mitosis do the sister chromatids line up in the center of the cell?

They line up at Metaphase

The correct answer will be metaphase.

Explanation:

Mitosis is a type of cell division in which parent cell divides to form two daughter cells with same genetic material as of parent cell.

Mitosis proceeds into 4 phases: prophase, metaphase, anaphase and telophase.

Metaphase is the phase of cell division marked by the alignment of the chromatids at the equatorial line or in the center of the cell and condensation of the chromatids to form chromosomes which can be easily observed under microscope.

Thus, metaphase is the correct answer.

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.