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Fungi are organisms which have cell wall but lack chloroplast. Euglena and volvox are examples of algae. Proliferation of certain plants reduces oxygen supply to other organisms in water bodies. This is called eutrophication.
Viruses which enter a bacterium are called bacteriophage. Penicillium is a genus of fungi which is used for producing penicillin (an antibiotic). Cladonia is a group of lichen.
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