Examlex
Which of the following cannot (at least currently) be used to generate electricity directly?
Toxins
Poisonous substances produced by living organisms, often used as defense mechanisms against predators or to incapacitate prey.
Fossilization
The process by which organic materials are preserved in the Earth's crust over geological time, becoming fossils.
Minerals
Naturally occurring inorganic substances with a definite chemical composition and crystalline structure, vital for various biological and industrial processes.
Sediment
Particulate material that is transported and deposited by wind, water, or ice, often forming layers on the Earth's surface.
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