Pollution
...tozoan Any of a large group of single-celled, usually microscopic, eukaryotic organisms, such as amoebas, ciliates, flagellates, and protozoan Pseudopodia A temporary projection of the cytoplasm of certain cells, such as phagocytes, or of certain unicellular organisms, especially amoebas, that serves in locomotion and phagocytosis. Spore A small, usually single-celled reproductive body that is highly resistant to desiccation and heat and is capable of growing into a new organism, produced especially by certain bacteria, fungi, algae, and nonflowering plants. Sporozoan Any of numerous parasitic protozoans of the class Sporozoa, most of which reproduce sexually and asexually in alternate generations by means of spores. They are frequently transmitted by bloodsucking insects to different hosts, where they cause many serious diseases, such as malaria and coccidiosis. Alternation of generations The regular alternation of forms or of mode of reproduction in the life cycle of an organism, such as the alternation between diploid and haploid phases, or between sexual and asexual reproductive cycles. Colony A discrete group of organisms, such as a group of cells growing on a solid nutrient s...