Most have 4, two have none and more than one have 8, what are they Hints: each one has its own name

they all vary in size

some students stress about remembering them for an important test

none of them existed until the late 1700s

pinterest: xxxsociety (if anyone sees this follow me on there xd)

according to greek mythology, persephone, the queen of the underworld, was the daughter of zeus and demeter, the goddess of harvest and fertility. she was also called kore, which means "maiden" and grew up to be a lovely girl attracting the attention of many gods.

explanation:

it is based on the same philosophy as health insurance

industrial revolution, in modern history, the process of change from an agrarian and handicraft economy to one dominated by industry and machine manufacturing