An index fossil is an fossil of an organism which lived at only one time during the evolutionary history. The index fossils are useful since they are only obtained from rock of one particular evolutionary time zone. Restricted presence of index fossils represents the fact that they lived during a relatively brief period of geologic history. These fossils are used for dating and correlating the various time zones of evolutionary history
A lysosome is a membrane-bound cell organelle that contains digestive enzymes. Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts.
DNA's information can expressed through flow of information from DNA to RNA to protein provides the cell with a potential control point for self-regulating its functions
Gold's natural state is solid. Gold is a soft, heavy, yellow elemental metal that has a great value. Gold has a fixed shape and volume and its natural state is solid.
