Earthquake or earthquake are sudden, passing tremors that occur on the Earth's surface, caused by underground shocks of crustal rock plates 300m below the ground. Other reasons considered are gas displacements (mainly methane) and volcanic activities. There are two types of earthquakes: those of natural origin and the induced ones.

It is a monosomy in which affected individuals exhibit female sex but generally do not have sexual chromatin. Examination of its karyotype commonly reveals 45 chromosomes, and of the pair of sex chromosomes there is only one X; We say that these individuals are XO (x-zero), and their karyotype is represented by 45 X.

It is a flexible ring, covered by a thin rubber membrane, that the woman should place in the vagina to cover the cervix. As a barrier, it prevents sperm from entering and should be used together with a spermicide no later than 6 hours prior to sexual intercourse. Patient compliance depends on the correct use of the device.

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As we have seen, glycolysis consists in the transformation of one glucose molecule over several steps into two pyruvic acid molecules. In this process four hydrogens are released, which combine two by two, with molecules of a cell substance capable of receiving them: NAD (nicotinamide adenine dinucleotide).

No other fabric illustrates the concept of teamwork as well as nervous tissue. The transmission of information by nerve cells resembles a true relay race, in which one neuron is connected to another, each playing a role in the circuit they organize.