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>.
The outer membrane of the mitochondria is largely permeable and allows many molecules to freely diffuse across it. The inner membrane, on the other hand, is highly impermeable, only allowing water, carbon dioxide, and oxygen to freely cross it.