father or mother. Person's, animal's mother and father. be parent to.

To do something without stopping, or after pausing.

To gain knowledge by doing things.

substance used to stimulate production of antibodies and provide immunity against diseases.

maintenance of law and order by police force. To control an area, or group with a police force.

1,000,000.

person who watches or notices. People whose job it is to watch or notice things.

To lessen the severity of something.

each of four equal or corresponding parts into which something is or can be divided. One of four equal periods of play in some sports. To split something into four equal parts.

cause, explanation, or justification for action or event. Explanations for why some things occurred or was done. think, understand, and form judgements logically.

continuous physical force exerted on object. To apply force to something.

person or organization that employs people. People or firms that hire workers.

system or means of conveying people or goods from place. To cause to feel you are in a previous time.

blown by wind with great force. control and operation of motor vehicle. To move cattle from one place to another.

To know someone or something because you have seen or heard him or her or experienced it before.