The economy of Mexico has been helped or hindered by geography. For example, thanks to the Sierra Madre mountain ranges, Mexico is one of the richest countries in terms of mineral resources such as silver, mine lead or sulfur. The lowlands along the gulf of Mexico have been a warm sea for millions of years so this region is rich in oil and natural gas.
<span>Geography also affects weather patterns, specially on the northern regions of Mexico. For example, the Chihuahuan desert is the result of a 'rain shadow' induced by the Sierra Madre Occidental. This has limited agriculture to small fertile pockets within Mexico, which cover only 12-17% of Mexico's territory. </span>
<span>Finally, geography makes some productive activities more difficult, thus increasing costs. For example, most of Mexico is quite hilly, preventing an extensive railroad network from ever developing; such network would ease movement from and to shipping ports, cutting transportation costs.</span>
By altering the function of regulatory genes virus can risk cancer.
Certain infectious agents, such as viruses, bacteria, and parasites, can increase the risk of cancer . In order to reproduce and make more viruses, a virus must enter a living cell and take over the cell's machinery. Some viruses accomplish this by embedding their own DNA (or RNA) into the host cell's. So when DNA or RNA impacts the genes of the host cell, it can cause the cell to become cancerous.
Most viruses only affect specific cells in the body, such as cold virus viruses that affect the nose and throat lining. That is why certain viruses are just associated with specific types of cancer.
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Answer:
electroencephalogram (EEG)
Explanation:
The Electroencephalogram
This is an instrument use in determining or measuring of the electrical activity of the brain. It measures from the surface of the scalp that enables us to measure the generalized activity of the cerebral cortex. Its strength is determined by the amplitude ot he device. It is is used to help diagnose certain neurological conditions that is seizures of epilepsy and for other research purposes.
EEG as it is called for short simply measures electrical activity generated by the brain. It measures the voltage generated as a result of the current that flow during synaptic excitation of the dendrites of many pyramidal neurons in the cerebral cortex that is found beneath the the skull and comprises of most of the brain's mass.
