Answer:
Explanation:
El impulso nervioso es un impulso eléctrico. Para que el impulso eléctrico se transmita, los iones positivos de sodio que están en estado de reposo y están presentes fuera de la neurona deben traspasar la membrana celular. En la medida que el impulso avanza por la membrana, su interior recobra la carga negativa.
None of them are likely to express the recessive trait because they all have a dominate allele in their genotype. 2 of them will be homozygous dominant, but two of them will be heterozygous and carriers for the disease.
The natural process by which the ozone layer get depleted are sun spots and atmospheric winds. The volcanic eruptions are also responsible for the depletion of the ozone layer.
The thinning of the ozone layer, which is present in the upper atmosphere is called ozone layer depletion. These natural processes causes and some chemicals compounds releases chlorine and bromine, which in exposure of high ultraviolet light causes the depletion of ozone.
The ozone layer found in the stratosphere of the earth atmosphere. This region protects the earth from harmful ultraviolet radiation of the sun. It has potential to absorb around 99% of the harmful ultraviolet radiation.
The main causes of ozone depletion are chloroflorocarbons, carbon tetrachloride, methylbromide. The natural processes does not cause more that 1 to 2 % of the ozone depletion.
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Answer: A
Evolution is the idea that species change over time, and natural selection is a mechanism by which evolution takes place.
