1 the organism's functional role in the community (e.g. TROPHIC LEVEL).  other conditions of the organism's existence, such as preferred temperature, moisture and pH, combining spatial habitat with functional interaction with other species.
birthday(Noun) The anniversary of the day on which someone is born. birthday(Noun) The anniversary of the day on which something is created. birthday(Noun) The date on which someone is born or something is created, more commonly called birthdate or date of birth.
a particular time, especially as marked by certain circumstances or occurrences: They met on three occasions. 2. a special or important time, event, ceremony, celebration, etc.: His birthday will be quite an occasion. 3. a convenient or favorable time, opportunity, or juncture: