Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Symbiosis (from Greek σύν "together" and βίωσις "living") is close and often long-term interaction between two different biological species. In 1877 Albert Bernhard Frank used the word symbiosis (which previously had been used to depict people living together in community) to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."
What nationality was Heinrich Anton de Bary?
A: German

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The electronic instrumentation and minimal arrangement of Charanjit Singh's Synthesizing: Ten Ragas to a Disco Beat (1982), an album of Indian ragas performed in a disco style, anticipated the sounds of acid house music, but it is not known to have had any influence on the genre prior to the album's rediscovery in the 21st century.
What did Beat's album contains?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
FETs are divided into two families: junction FET (JFET) and insulated gate FET (IGFET). The IGFET is more commonly known as a metal–oxide–semiconductor FET (MOSFET), reflecting its original construction from layers of metal (the gate), oxide (the insulation), and semiconductor. Unlike IGFETs, the JFET gate forms a p–n diode with the channel which lies between the source and drain. Functionally, this makes the n-channel JFET the solid-state equivalent of the vacuum tube triode which, similarly, forms a diode between its grid and cathode. Also, both devices operate in the depletion mode, they both have a high input impedance, and they both conduct current under the control of an input voltage.
How is a JFET different from an IGFET?
A: the JFET gate forms a p–n diode with the channel

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Due to the patriarchal nature of Arab society, Arab men, including during the slave trade in North Africa, enslaved more black women than men. They used more black female slaves in domestic service and agriculture than males. The men interpreted the Qur'an to permit sexual relations between a male master and his female slave outside of marriage (see Ma malakat aymanukum and sex), leading to many mixed-race children. When an enslaved woman became pregnant with her Arab master's child, she was considered as umm walad or "mother of a child", a status that granted her privileged rights. The child was given rights of inheritance to the father's property, so mixed-race children could share in any wealth of the father. Because the society was patrilineal, the children took their fathers' social status at birth and were born free.
What were female slaves used for?
A:
domestic service and agriculture