| A | B |
|---|
| heterotroph | an organism that gets food by eating other organisms or their byproducts and that cannot make organic compounds from inorganic materials |
| parasite | an organism that feeds on an organism of another species (the host) and that usually harms the host |
| host | an organism from which a parasite takes food or shelter |
| protist | an organism that belongs to the kingdom Protista |
| algae | eukaryotic organisms that convert the sun's energy into food through photsynthesis but that do not have roots, stems, or leaves |
| phytoplankton | the microscopic, photosynthetic organisms that float near the surface of marine or fresh water |
| fungus | an organism whose cells have nuclei, rigid cell walls, and no chlorophyll and that belongs to the kingdom Fungi |
| hypha | a nonreproductive filament of a fungus |
| mycelium | the mass of fungal filaments, or hyphae, that forms the body of a fungus |
| spore | a reproductive cell or multicellular structure that is resistant to stressful environmental conditions and that can develop into an adult without fusing with another cell |
| mold | a fungus that looks like wool or cotton |
| lichen | a mass of fungal and algal cells that grow together in a symbiotic relationship that are usually found on rocks or trees |
