Answer:
Air particles are a mixture of solids and liquids that are microscopically tiny and suspended by air currents. It can stay in the atmosphere for a few hours to a month or two. Their constituents can be various harmful substances such as heavy metals - lead, nickel, arsenic, cadmium or polycyclic aromatic hydrocarbons
Explanation:
Air particles, nitrogen dioxide and ground-level ozone are now considered to be the three most polluting substances in human health. Exposure during peak concentration and long-term exposure to these pollutants can cause damage from respiratory distress to premature death.
Answer:
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Explanation:
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Answer:
Any of a group of submicroscopic entities consisting of a single nucleic acid chain surrounded by a protein coat and capable of replication only within the cells of living organisms: many are pathogenic
Answer:
Un grupo de evolucionistas moleculares de los Institutos Nacionales de la Salud (NIH, en Bethesda, Estados Unidos) acaba de concluir que LUCA, el organismo primitivo del que provienen todos los seres vivos actuales -sean microbios, gladiolos o seres humanos- era una bacteria de vida autónoma con 572 genes.
