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.
In the vast majority of plants and animals, the body is made up of numerous cells. They are called multicellular organisms. A multicellular organism is actually an aggregation of cells. Here a group of cells functions in a same way to form a tissue or an organ (Example: Xylem vessels, cork cells, cells in the skin).Multicellular organisms have a great capacity to survive than unicellular organisms.n some lower forms of life (Example: Euglena, Amoeba) The body is formed of a single cell; these organism are described as unicellular. In a unicellular organism, all life activities are carried out by itself with its internal structures. The intracellular structures are called the organelles.