Which choice describes the heart? A. An indusial cell
B. A group of one cell type working together
C. A series of organs working together
D. A structure made of tissues that work together

D

Explanation:

it is not c since the heart is one organ

and it is not b since there is more than just muscle in the heart so more than one kind of cell

and for a i assume you meant industrial cell which is a machine part  

d is the answer heart an organ has 2 or more kinds of tissue that preforms a particular function

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.