officially agreed or accepted as satisfactory. To have a positive opinion of someone or something.

substance used to stimulate production of antibodies and provide immunity against diseases. Immunogens consisting of a suspension of weakened or dead pathogenic cells injected inorder to stimulate the production of antibodies.

To start doing again after a break, pause, or stop.

officially compulsory, or otherwise considered essential. To demand that someone does something.

relating to anatomy, functions, and organic disorders of nerves and nervous system.

To take a job or the responsibilities of another.

To defend someone or something from harm or danger.

For a reason.

Occasion when something can be seen, e.g. a movie. To explain or teach how something is done.

in space separating things. Among two or more people who share something.

To test your knowledge or ability.

(of goods or services) brought into country from abroad for sale. To bring goods from one country into another.

From one end or side of something to the other. From the beginning of something until the end. Over, in, across an entire thing or place.

person who is studying or has expert knowledge of one or more of natural or physical sciences. People who are trained in a science.

Being what was wanted or needed. used to greet someone in polite or friendly way. instance or manner of greeting someone. To greet someone who has just arrived.