That´s a great question! Living things can
have a minimum of one cell (called unicellular
organisms). There are a lot of single celled
organisms, like bacteria, algae (plants), some
fungi, and protozoa. Many unicellular organisms
live in colonies with others of their species.
Amazingly, viruses don´t need any of their own
cells at all, they can reproduce in other
organisms cells and can just be genetic material
(DNA or RNA) protected in a coat of proteins
called a capsid.
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