Diffusion is the movement of a substance? A. only through a lipid bilayer membrane
B. from an area of low concentration to an area of higher concentration
C. only in liquids
D. from an area of high concentration to an area of lower concentration

D.from an area of high concentration to an area of lower concentration

Explanation:

Explanation:

Diffusion also happens for gases, so it is not C. Diffusion does not require energy, so it is not B. It cannot be A as diffusion can happen through other membranes, I think? Therefore, it is D.

a warm, wet climate will produce the highest rate of weathering. the warmer a climate is, the more types of vegetation it will have and the greater the rate of biological weathering (figure below). this happens because plants and bacteria grow and multiply faster in warmer temperatures.

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.