officially agreed or accepted as satisfactory. To formally accept something or grant permission.

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 need something, to make it necessary.

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

suppose to be the case.

keep safe from harm or injury.

For a reason.

action of showing something, or fact of being shown. To prove something to be true.

in space separating things. From one person, thing, or place, to another.

To ask questions; to look closely at something.

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

continuing or valid to final destination. expressing movement into one side and out of other side of opening etc.. moving in one side and out of other side of.

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 accept or receive something happily and gladly.