Assuming that the graph follows the normal laws of economics, the line represents supply
A house is generally considered an appreciating asset because it may increase in value over time.
This is because when you buy a house, over time you are probably going to invest in it, change it a bit, add more rooms, change the old equipment, etc. which will all contribute to the increase of its value in the future. This is why it is an appreciating asset.
The correct answer for the question that is being presented above is this one: "B. building of the transcontinental railroad --> disappearance of the frontier." The pair of events that did the first event most directly influence the second is the building of the transcontinental railroad --> disappearance of the frontier.
Hormones: they are the chemicals of the endocrine system used to send messages to organs and tissue throughout the body
neurotransmitters: a chemical substance released at the end of a nerve fiber at the arrival of a nerve impulse, by diffusing across the synapse, which then causes the transfer of the impulse to another nerve fiber, etc.
Hormones and neurotransmitters are equally both similar and different in many ways. A characteristic that they both share, is that they are both forms of sending messages into the body. The only difference being, a neurotransmitter is sends signals to balance target cells, aka muscles or glands. Hormones send messages and signals throughout the body and organs.
