Ferns are not of major economic importance, but some are used for food, medicine, as biofertilizer, as ornamental plants and for remediating contaminated soil. They have been the subject of research for their ability to remove some chemical pollutants from the atmosphere.
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8 mauricio pq no se sabe si se llama mauricio y no entiendo ingles
Los científicos piensan que el Sistema Solar se formó cuando una nube de gas y polvo en el espacio fue alterada. Quizás debido a la explosión de una estrella cercana llamada Supernova. Esta explosión provocó ondas en el espacio las cuales provocaron que la nube de gas y polvo se contrajera.
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For instance, sin(x) = 1/csc(x) is an identity. To "prove" an identity, you have to use logical steps to show that one side of the equation can be transformed into the other side of the equation. You do not plug values into the identity to "prove" anything.
Explanation:
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