All of the above but in terms of United States government and History the answer is C.) Unconstitutional.
Answer:
Urban development can magnify the risk of environmental hazards such as flash flooding. Pollution and physical barriers to root growth promote loss of urban tree cover. Animal populations are inhibited by toxic substances, vehicles, and the loss of habitat and food sources
The correct would be option C, Planting a series of different crops each year.
Charlemagne's new technique for farmers to increase nutrients in the soil involved Planting a series of different crops each year.
Explanation:
Charlemagne was a King of the Francs. He was a great emperor and ruled the Francs, Lombard and Romans during his empire. He was very much involved with his people. He was concerned about the agricultural development in his territories.
He introduced a new technique to the farmers of his region to increase the nutrients in the soil. He told them to plant a series of different crops each year. This will increase the nutrients in the soil. Every year, new crops will be planted, and the soil remain fertile and will give more crops each year.
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Nerve net, primitive nerve arrangement forming the entire nervous system of many cnidarians and a part of more advanced nervous systems. Cytoplasmic processes join the nerve cells (neurons) of nerve nets. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. In vertebrates, nerve nets may be found around blood vessels and the alimentary tract.
