The first historical era, more than 5,500 years ago, is called and refers to a time before people developed writing.

prehistoric era

Explanation:

this is the era around when people started to write

where is the passage?

can't without the passage.

post the full question.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b