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masha68 [24]
3 years ago
14

Convert 330 minutes to hours, and show your work.

Biology
1 answer:
poizon [28]3 years ago
4 0
It would be "5.5 hours". Just divide 330 minutes by 60. 60 minutes = 1 hour.
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The correct answer is option D. She should place one flower in a similar container, but not pump carbon dioxide into it. She should also give each plant the same amount of water.

In the experiment, a control should be present to compare the effect of the variable in the experiment. In the control sample, all the parameters except the variable should be same as the experimental group. In this way, the comparison of the effect of variable can be easily done in an experiment.

In this case, the variable is amount of carbon dioxide the plant receives. So, Stella should include a control group by placing the plant in the same container and leave it on atmospheric carbon dioxide supply, no extra carbon dioxide should be pumped into it.  Also, the amount of water she give to each plant should be the same to maintain the water level as constant.

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4 years ago
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Las centrales eléctricas representan un riesgo latente para el medio ambiente, con lo cual ellas deben estar bajo un estricto marco regulatorio y control por parte de las instituciones gubernamentales especializadas para tal fin. Por ejemplo, las centrales hidroeléctricas generan la inundación permanente de grandes áreas (incluso miles de hectáreas) con el objetivo de aumentar la capacidad de generación de energía eléctrica. Por otra parte, se cree que aproximadamente el 50% de la polución industrial se debe a la acción de centrales eléctricas convencionales, las cuales utilizan la combustión del carbón, el petróleo o el gas natural con el objetivo de generar energía eléctrica. Este tipo de centrales eléctricas producen dióxido de carbono (CO2), el principal gas de efecto invernadero y considerablemente deterioran la calidad del aire que respiramos mediante la liberación de partículas contaminantes, presentando efectos adversos tanto para la salud humana como para el medio ambiente. Finalmente, la instalación de centrales eléctricas a base de la energía nuclear no generan gases causantes del efecto invernadero, pero pueden representar un serio riesgo debido a la posibilidad de liberación de materiales radiactivos durante accidentes nucleares, los cuales son capaces de contaminar permanentemente el medio ambiente. En este punto, es importante aclarar que los riesgos de accidentes en centrales nucleares se ha reducido notablemente en las últimas décadas y, por lo tanto, este tipo de centrales eléctricas se consideran relativamente seguras.

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