substance produced by living organism which acts as catalyst to bring about specific biochemical reaction. Substance in living things helping chemical change.

written or printed representation of something.

series of actions towards achieving something. Sets of changes that occur slowly and naturally. perform mechanical or chemical operations on.

To need something, to make it necessary.

educational talk to audience. To give a talk or speech about a subject.

medicine that inhibits growth of or destroys microorganisms. Medicines that kill bacteria to fight infections.

Useful; not just for decoration.

process of translating words or text from one language into another.

Act of making something (e.g. a bomb) active.

Be controlled or determined by..

person who has changed faith or belief. To switch from a religion, belief etc. to another.

Act or process of growing bigger or more advanced.

A path or way that you can walk.

Substance which is one of the fundamental constituents of the nucleus of the cell and which forms the supports of the hereditary message.

(of shooting) carried out to protect exposed person from enemy. thing used to protect, decorate, or conceal something else. To discuss a subject in a talk or meeting.