Answer:b. developments such as the three-field system and the padded horse collar meant that agriculture actually improved from classical time.
Explanation:Early Middle Ages or Early Medieval Period , sometimes referred to as the Dark Ages , as lasting from the 5th or 6th
century to the 10th century.
In the 19th century the Early Middle Ages were often labelled the "Dark Ages" , a characterization based on the relative scarcity of literary and cultural output from this time.
The early middle Ages generally believed to have started with the fall of the Roman Empire in 476 and to have lasted about 1,000 years until about 1450. The beginning of the Middle Ages is called the Dark Ages because the great civilizations of Rome and Greece had been conquered.
Explanation:
Green house effect occurs when the wavelenght of the infrared radiation in the incident solar radiation, looses some of its energy on reflection from the earth surface, making it longer and unable to pass through the greenhouse gases that act like a blanket around the earth.
The reflected radiation has a longer wavelenght because it looses energy to the earth as heat; leaving it with a new wavelenght too long to go through the greenhouse gases.
The jar envoirment does not provide the earth-like material that can absorbs some of the energy of the incident radiation so it goes out with relatively the same energy. Also, the refractive index of the green house gases and the glass used in the lab might not be the same so modeling it with a glass might not produce the same effect.
Finally, the light source used might not contain enough infrared energy as an incident solar radiation.
Very war based they taught war war and more war
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<span>Farmers from the Netherlands, France, and other European colonies that settled in South Africa became known as Boers.
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Most scholars and scientists agree that modern humans originated in Africa.
