toxic substances
chemical substances
hazardous substances
natural substances
organic substances
synthetic substances
biological substances
controlled substances
substances abuse
substances identification
different substances react in various ways when combined.
many substances can be harmful if ingested.
scientists study the properties of substances to understand their behavior.
some substances are essential for human health.
substances can change state from solid to liquid when heated.
it's important to store hazardous substances properly.
natural substances often have medicinal properties.
some substances can be recycled to reduce waste.
substances in the environment can affect wildlife.
researchers are developing new substances for renewable energy.
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