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8.2 Study Guide

fossil remains or traces of an organism that lived in the past
referring to forms of life that have died out. extinct
fossil record record of life on earth provided by fossils.
mold a fossil impression left in rock by the hard parts of an organism.
cast a fossil formed by minerals in water that build up in a mold
________ form when an animal or plant dies and is covered by sediment. The sediment forms a rock. The animal dissolves and leaves an impression in the rock. Fossils
You can learn which order animals developed on the earth and how the earth has changed over the years from a ________ _______ fossil record
A ______ is a fossil that is an impression in a rock of an animal or plant. A ______ is formed in a mold by sediment. The ______ comes first. mold; cast; mold
_______ _______ organisms left little fossils because their body would decay before the fossil could form. Soft bodied
Fossils of organism X are always found in rock layers below organism G. Both are always found underneath organism A. Which organism appeared on earth first? Which evolved most recently? Organism X was 1st, organsim G was second, Organsim A was most recent
Created by: bob dohl