What has varied among scientists?
The definition of symbiosis.
What do some believe?
That it should only refer to persistent mutualisms.
What about others?
They believe it should apply to any persistent biological interaction.
How else could you describe it?
Mutualistic, commensalistic, or parasitic.
How many years was it debated?
130 years.
What is used now?
De Bary definition.
By what?
A broader definition.
What word is being defined?
Symbiosis.
What language did it originate from?
Greek.
How was it used in 1877?
To describe the mutualistic relationship in lichens.
How was it used previously?
To depict people living together in community
What about in 1879?
The living together of unlike organisms.
By whom?
Heinrich Anton de Bary.
What was his occupation?
Mycologist
Nationality?
German.
What is obligate?
Some symbiotic relationships.
What does that mean?
It means both symbionts entirely depend on each other for survival.
What about others?
They are falculative.
Meaning?
Optional
What does symbiosis mean in other words?
It's the close and sometimes long-term interaction between two species.
Are they biological?
Yes.