Choose the BEST paraphrase of this text: Black holes are extremely compact space objects that were once massive stars.
A) Black holes are super tiny space things that used to be big old stars.
B) Black holes are extremely compact space objects that were once massive stars.
C) Massive stars are extremely compact spaces objects that were once black holes. D) The extremely small objects in space that at one time were enormous stars are called black holes. Hint Communication (2.3) Quote Or Paraphrase ID: 55394

D

Explanation:

The extremely small objects in space that at one time were enormous stars are called black holes.

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.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.