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monitta
3 years ago
5

Why do scientists break earth's history down into smaller pieces​

Biology
1 answer:
nevsk [136]3 years ago
8 0

Answer:

to see if they can find any other information to see what it worth how valuable it is or wht it is

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4. Describe how a selectively permeable membrane is involved in osmosis. Include the role that the solute concentration plays in
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All cells of living organisms depend on a protective barrier, called a membrane, that will ensure that the contents in and out of the cell are appropriately separated and balanced. In animal cells, especially, the cell´s plasma membrane works as a semi-permeable barrier that divides two environments that are equally submerged in water: the extracellular, and the intracellular environments. But it does not only divide water from both compartments; it also maintains a regulatory role in solute concentration, given that the laws of physics do not change, and water will always follow after solutes, and will go to where there is less concentration of water molecules.  

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Water usually moves by osmosis in both plant cells and animal cells, thanks to the membrane´s permeability (in plants the cell wall) to it. Water, will thus move from one side to the other given two factors: concentration of water, and concentration of solutes; with water always following towards places with higher concentration of solutes, and lower concentration of water molecules. This balance of water and solutes on both spaces is vital to ensure that water does not leak in great amounts on either end, either bursting the cell, or dehydrating it to the point of death. And this is what the characteristic of semipermeability does; it allows water to diffuse through osmosis, but under certain conditions, which are kept under regulation by the membrane through other mechanisms like facilitated transport, and active transport, of solutes and molecules.

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