Is an experiment in which participants do not know if they are in the experimental or the control group, but the experimenters do know which participants are part of which group?

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Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment