Which statement best summarizes the central idea in this excerpt?

before the civil war, most enslaved people were living in the southern part of the union.
the union fought in the civil war because they wanted to strengthen, perpetuate, and extend slavery.
the civil war occurred because people in the south wanted to protect and spread the practice of slavery.
before the civil war, the government did not try to stop slavery, but only tried to keep it from growing.

The Civil War occurred because people in the South wanted to protect and spread the practice of slavery.

Explanation:

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.