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Answer and Explanation:

Radiation: It can also be called irradiation and allows heat to be transmitted through electromagnetic waves. This type of heat transfer does not require direct contact between two bodies, as electromagnetic waves have the ability to propagate quickly, even in a vacuum. Any body, having a temperature, can irradiate these onds and the higher the temperature, the greater the irradiation. An example of this occurs between the earth and the sun.

Conduction: In conduction, the heat is transmitted through the agitation of the molecules, which when colliding with each other transfer heat quickly. Metals that are good conductors of heat are bodies that use conduction a lot. That's because by heating up a part of that metal, the molecules will start to move quickly, and they will hit each other violently, spreading heat to all the metal.

Convection: This is the type of heat transfer common between gases and liquids. this type of heat transfer occurs with the difference in density in the liquid or gas. This is because the warmer part of the liquid or gas becomes lighter than the cold part, so the cold part will tend to go down, while the hot part will tend to go up. This cycle will be repeated several times, until all the liquid or gas has the same temperature.

answer; i believe the correct answer is benjamin harrison;

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."