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Chapter 15 Vocabulary

Author: Henry Kleilein
Across
Development of a species or taxonomic group of organisms
Dealing with the geographical distribution of animals and plants
The age of a rock given as the number of years since the rock formed
Evolution of organisms best adapted to the environment
Layers of rock
Down
The placement of one thing on top of another
A trait that helps an organism survive and reproduce
The age of a rock compared to the ages of rock layers
Ability of an organism to survive and reproduce in its environment
Plant or animal that existed in a past geological age and that has been excavated from the soil