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>.
What types of organisms live in pond water? A: Even a single drop of pond water may contain thousands of organisms, including different types of bacteria, protozoa, algae, rotifers, hydras and worms. Although most of the organisms that live in water are microscopic, a few are large enough to see with the naked eye. Continue Reading.