- Life Sciences
an antigen preparation that stimulates the immune system to give protection against a particular disease or a group of diseases.
(also called egestion or elimination) the process of passing faeces out through the anus.
simple epithelium with elongated, cells that lines the stomach, small intestine, urethra, vas...
the domain that contains prokaryotic micro-organisms. Some live in extreme environments, such as...
small solid particles of matter such as soot, ash, metal and dust.