Jorah is a sword collector. he often travels to conventions and fairs to buy rare swords for his collection, which can be expensive. if jorah
knows that a vendor ata convention in oldtown will be selling a rare sword he wants, jorah will travel to the convention if
a. the marginal benefit of buying the rare sword exceeds the marginal cost of traveling to the convention
b. the marginal cost of traveling to the convention exceeds the marginal cost of buying a rare sword.
c. the marginal cost of buying the rare sword exceeds the marginal benefit of traveling to the convention
d. the marginal cost of traveling to the convention exceeds the marginal benefit of buying the rare sword.

“dear sir: it is with great reluctance, i trouble you on a subject, which does not fall within your province; but it is a subject that occasions me more distress, than i have felt, since the commencement of the war; and which loudly demands the most zealous exertions of every person of weight and authority, who is interested in the success of our affairs. i mean the present dreadful situation of the army for want of provisions, and the miserable prospects before us, with respect to futurity. it is more alarming than you will probably conceive, for, to form a just idea, it were necessary to be on the spot. for some days past, there has been little less, than a famine in camp. a part of the army has been a week, without any kind of flesh, and the rest for three or four days. naked and starving as they are, we cannot enough admire the incomparable patience and fidelity of the soldiery, that they have not been ere this excited by their sufferings, to a general mutiny or dispersion. strong symptoms, however, discontent have appeared in particular instances; and nothing but the most acitive efforts every where can long avert so shocking a catastrophe.” what’s the central idea?

The development of simple stone tools by early hominids led to the ability to procure meat more efficiently. this in turn led to the change in diet that included larger amounts of protein. many scholars believe that this shift in diet was a significant part of how our ancient ancestors adapted so quickly to a varied set of environments, and thus were able to begin cultural development. this demonstrates the intimate connection between

The first thing that baby ducks usually see after hatching is their mother. they then follow their mother everywhere: into the pond, around the farm, and eventually through the air. this type of behavior is called