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8.2 Study Guide
Question | Answer |
---|---|
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 |