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Fossils By: Lara Iskandar A3 4/23/18

Across
Solidified remains or imprints of once-living organsims
Plants take in carbon dioxide during______
Historical sequence of life
When a whole species dies off and can never come back
Down
Most fossils are found in ________ rocks
When a plant or animal dies, they no longer take in _________
The process of estimating a fossil's age
The amount it takes for half of the chemicals in the rock to decay or turn into another chemical