The suspension can be prepared from simple chemicals that would have been easily available locally since antiquity.

Other saprophytes break down dead plants and animals into simple chemicals.

Plants utilize simple chemicals as hormones, which move more easily through the plant's tissues.

Only plants (and some bacteria) can live off minerals and simple chemicals.

The Italian team went on to suggest a solution they had prepared from simple chemicals available in the fourteenth century.

"But it means you deliver large amounts of simple chemicals, and maybe some complex ones, that can lead to life directly."

It was genuine love he was feeling, concern and care born of their experiences together, rather than simple chemicals in his bloodstream.

Watched as the nearly beaten man collected his materials: simple chemicals, stones, and a bamboo tube.

They are not simple chemicals, but are very complicated and very important to life.

And unlike many nerve agents, which tend to be simple chemicals, it is a large protein the skin has difficulty absorbing.