Which of the following is true of gristmills? There is more than one correct answer to this
question.
A They harnessed the power of water to operate.
B They required little labor to run.
C It took a long time to grind grain with a gristmill:
D Flour ground at a gristmill produced softer bread.

A They harnessed the power of water to operate.

B They required little labor to run.

Explanation:

The Gristmills is a system whereby the local farmers brought their grains such as corn, millet etc to a locally setup mill in-order to turn it into floor. This floor is then used to make bread thereby serving their families as a staple food.

In return the operator of the local mill get what is called a millers toll which more like his wage for the efforts expended in producing the corn. This method is popular in most of the Muslim countries in the 8th century. And, also, it tends to produce enough floor for the making of bread which serves the whole populace.

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answer:   migrations were important in the neolithic period. "two major migrations passing through southeastern europe were confirmed by the means of archaeo-genetic studies."

the first migration was the early neolithic period -- 6,000 before common era (bce) -- when the first farmers, from anatolia -- asia minor -- spread through europe. the second migration occurred during the early bronze age (3,000-2,500 bce) when the so-called "steppe population," from the eurasian steppe, replaced much of northern europe's previous population.

the first farmers of northern and western europe passed through southeastern europe with limited hunter-gatherer genetic admixture, which occurs when two or more previously isolated populations begin interbreeding. however, some groups that remained mixed extensively -- without the male-biased, hunter-gatherer admixture that prevailed later in the north and west, according to latest discoveries. southeastern europe continued to be a nexus between east and west, with intermittent genetic contact with the steppe people up to 2,000 years before the migrations that replaced much of northern europe's population.

"in some places, hunter-gatherers and incoming farmers seem to have mixed very quickly," says iain mathieson, a geneticist at the university of pennsylvania, who was first author of the paper. "but, mostly, the two groups remained isolated, at least for the first few hundred years. these hunter-gatherers had been living there for thousands of years, and it must have been quite a shock to have these new people show up -- with a completely different lifestyle and appearance."