Definition
adjective
(general) Compulsory; restricted to a set of parameters or conditions; having no alternative system or pathway.
(biology) Capable of functioning or surviving only in a particular condition or by assuming a particular behavior.
Supplement
This descriptive term, which means ‘by necessity’ is used mostly in biology, such as the following:
Word origin: L obligātus (ptp. of obligāre to bind).
Compare: facultative.
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The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas others have many cells that are organized into tissues, organs, and systems. The scientific study of the cell is called cell biology. This field deals with the cell structure and function in detail. It covers..
If New Zealand has lots of unique animals, it's also got a whole lot of unique plants. Find out more about some of them, and the roles they play in different natural ecosystems...
