Wiktionary(0.00 / 0 votes)Rate this definition: 1  sergeant(Noun) UK army rank with NATO code OR-6, senior to corporal and junior to warrant officer ranks. 2  sergeant(Noun) The highest rank of noncommissioned officer in some non-naval military forces and police.
Organism: is an individual living thing, such as a plant, animal, bacterium, protest, or fungus. An organism has a body made up of smaller parts that work together. There are many different organisms. Some scientist estimate there to be as many as 100,000 different organisms on Earth. Sometimes organisms are grouped by the environment they live in. For example, marine organisms live in the ocean.
A multicellular organism is an organism made up of more than one cell, such as you, me, dogs, cats, birds, bugs, etc. They are complex. They are much much bigger than uinicellâ¦ular organisms and have more body functions. A unicellular organism (also called single cell organism) is an organism made up of only one cell.