A scientist who studies plants is called a botanist.
Jupiter, Saturn, Uranus, and Neptune

A prophage is a bacteriophage (often shortened to "phage") genome inserted and integrated into the circular bacterial DNA chromosome or exists as an extrachromosomal plasmid. This is a latent form of a phage, in which the viral genes are present in the bacterium without causing disruption of the bacterial cell.
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The deeper down you get, the colder the water is
The answer is to produce wood and paper products :)