Examples of index fossils. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
Methyl cellulose. Methyl cellulose (or methylcellulose) is a chemical compound derived from cellulose. It is a hydrophilic white powder in pure form and dissolves in cold (but not in hot) water, forming a clear viscous solution or gel.
Cellulose is a nonliving substance that is made by the plant from grape sugar. It is a very complex carbohydrate chemically with the formula (C6H10O5)n Cells walls are variable in size and appearance.Some have walls that are heavily thickened, which are called Sclerenchyma Cells.t is a mixture of resins, gums, hydrocarbons, food and other substances formed in special called or vessels usually in the bark or leaves. Its use by the plant is not clear but may be involved in protection.