Single ring structures known as pyrimidines
Answer:
A cause or starting point the source of a rumor. 2 : the beginning of a stream of water the source of the Nile River. 3 : someone or something that supplies information a reference source. 4 : someone or something that provides what is needed a source of supplies a source of strength.
Theories basic to all of the life sciences include the cell theory because all living things are made up of cells.
