NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites.IST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites.
The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
In animal cells, when the water enters the cell(through osmosis) the pressure within the cell builds until it finally bursts. Example: A balloon filled with so much water thaâ¦t it bursts. Plant cells have cell walls so the cell membrane is not the only thing experiencing the pressure of water entering the cell. The cell wall acts as a backbone to contain the cell, thus preventing it from bursting. Example: A water-filled balloon in a cardboard box. 1 person found this useful.