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Sulphur dioxide (SO₂)

Sulphur dioxide emission is the main cause of acid rains. It is an intermediate product in the production of sulphuric acid.

Ichthyosaur

Fish-like marine dinosaurs which resembled dolphins; a good example of convergent evolution.

Water (H₂O)

Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.

Ammonia (NH₃)

Ammonia is a colourless gas with a characteristic pungent smell. Its solution in water is called ammonium hydroxide or household ammonia.

D-ribose (C₅H₁₀O₅)

The open-chain version of ribose, which occurs naturally in nucleic acids, coenzymes, nucleotides and nucleosides.

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