DraStic is a closed-source commercial Nintendo DS emulator for Android, Linux (on Raspberry Pi) and Pandora.
RougRayZ. Raspberry Pi is not powerful enough for PS2 emulation. If there is no roms folder for a specific system/emulator, then this system is not supported by the device (Rpi for example) you are using.
Domain of micro-organisms
Bacteria are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's... Wikipedia
