microorganism
microscopic living organism
bacteria
domain of micro-organisms
Marine microorganism
any life form too small for the naked human eye to see that lives in a marine environment
obelisk
viroid-like element
virus
non-cellular, submicroscopic infectious agent that replicates only inside the living cells of an organism
microaerophile
microorganism that requires lower levels of oxygen than are present in the atmosphere
lithophile
micro-organisms that can live within the pore interstices of sedimentary and even fractured igneous rocks to depths of several kilometers