1-¿En qué medio se encuentran más concentradas ambas sustancias? 2-Las moléculas de la situación A, ¿se mueven a favor o en contra de su gradiente de concentración? ¿Por qué?
3- Las moléculas de la situación B, ¿se mueven a favor o en contra de su gradiente de concentración? Explique.
4-¿En qué situación se necesitará energía para que las moléculas se muevan? ¿Por qué?
5-¿De dónde se obtiene la energía que se necesita para movilizar estas sustancias?
6- Mencionar un ejemplo de solución. En la misma, indicar soluto y solvente

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4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."