Commensalism :)
in case when bacteria and human, both are benifited.
Solar wind is a stream of charged partials released from the upper atmosphere of the sun. this plasma consists of mostly of electrons, protons and alpha partials with thermal energys betwqeen 1.5 and 10 kev
No, polar bears does not migrate.
The invention that allowed scientists to study cells for the first time is the Microscope
