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Silver bromide (AgBr)

A white, crystalline compound which breaks down when exposed to light.

Cysteine

An amino acid containing sulphur, one of the amino acids that make...

Asparagine

One of the twenty protein-building amino acids.

Lysine

One of the 20 amino acids that make up proteins.

Valine

One of the 20 amino acids that make up proteins.

Glutamine

One of the 20 amino acids that make up proteins.

Construction of a panel building

Buildings constructed of prefabricated concrete blocks were...

Harp

The harp is one of the oldest plucked string instruments.

Carbon monoxide (CO) (beginner)

Colourless, odourless gas, highly toxic to humans and animals in...

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the...

Nitrogen (N₂) (basic)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of...

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the...

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