â¢ SEMICOLON (noun) The noun SEMICOLON has 1 sense: 1. a punctuation mark (';') used to connect independent clauses; indicates a closer relation than does a period. Familiarity information: SEMICOLON used as a noun is very rare.
Cells are the building blocks of life. All living organisms are made up of cells. The cells were discovered by Robert Hooke in 1665. In the human body there are about 100 trillion to 1014 cells. hey are made up of a single cell. O rganisms like the amoeba, P aramecium are single-celled organisms, they are the oldest forms of life, they existed about 3.8 million years ago. Bacteria, a rchaea, protozoa, unicellular algae and un i cellular fungi are the main groups of unicellular organisms.
Save. Despite there being 118 known elements, only a handful of them are known to be found in living organisms. Indeed, the immense complexity of life is made up almost entirely of four elements: carbon, hydrogen, oxygen and nitrogen; approximately 99 percent of the human body is made up of these elements.dditionally, oxygen (along with hydrogen) is found in water, which is essential for a living organism because many chemical reactions within a living organism occur in water, and water is also the primary median in which cells live.