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>.
Put those worries aside, as this Floating Pond De-Icer will keep your pond from turning into an ice chest! The Floating Pond De-icer is thermostatically controlled with an automatic shut-off feature. The Styrofoam insides are completely enclosed within a rugged plastic housing while the cord exits from the top of the unit for added stability.