The Law of Superposition.
The Law of Superposition states that each layer is younger than the one beneath it.
Any genetically engineered organisms is referred to as a transgenic organism.
A transgenic organism is any organism that was modified genetically or engineered by humans, for certain purposes, in this case, the function of the thale cress is to break down toxic metals in the water (cress plants grow on water).
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Answer:
crude oil (petroleum) is the only natural liquid fossil fuel
