According to the Berner Classification for aqueous environments, which of the following definitions describes the Postoxic stage? O a. Dissolved Oxygen < 0.5% of Saturation and < 1mM of Sulfide Species O b. Dissolved Oxygen < 0.5% of Saturation and > 1mM of Sulfide Species Oc. Dissolved Oxygen < 0.5% of Saturation O d. Dissolved Oxygen > 0.5% of Saturation (~1 mM) Plants can assist in geochemical metal exploration, because: O a. they carry mineral grains to the surface O b. none of the other options O c. they produce gases that can be analysed between their roots O d. they transport dissolved metals to the surface through their roots

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.