[blank_start]Parasite[blank_end]: An organism which depends entirely upon another living organism for its existence in such a way that it harms that organism.
[blank_start]Pathogen[blank_end]: Causes disease.
[blank_start]Unicellular[blank_end]: Composed of one cell.
[blank_start]Prokaryotic[blank_end]: A cell which lacks a nucleus.
[blank_start]Decomposer[blank_end] / [blank_start]Detrivore[blank_end]: Breaks down dead matter to recycle nutrients into the ecosystem.
[blank_start]Symbiotic[blank_end]: A relationship between 2 organisms where one or both benefit.