person taking part in sport or game. Machines that play recorded material.

To make a choice about; choose after thinking.

likely or prone to be affected by. conditionally upon. People who take part in experiments or tests. To cause to suffer or experience something.

factor defining a system. Characteristics or constant factors; limits.

engaging in speech. action of talking. To say things or ideas to someone with words.

maintenance of constant difference in frequency between two or more connected circuits or components. To use marks to follow a wild animal.

recognize as different.

moving or growing quickly. An incident where someone tries to kill others. To use a camera to record a film/take a photograph.

Option on a device that can be changed, e.g. sound. To put (e.g. a vase) down carefully in a place.

Group with a shared interest or goal.

To establish the facts about; discover.

parts left over after other parts. Bodies of human or animals after it has died. To be left behind; to continue to exist.

When one thing is replaced by another.

at fast speed.

Quality of being easily hurt emotionally.