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Both fungi and algae have very small cells but so do most animals. Yet both of them are visible to naked eye just like other organisms. Why do we call them as microorganisms then ?

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    $\begingroup$ Not all fungi and algae are considered microbes, just the unicellular ones. $\endgroup$
    – John
    Nov 1, 2018 at 13:48

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Because both of those produce single-cells able to viably survive and grow on your own. For example, take a fungal spore and it can grow into a full fungus given enough food. I assume algae cells are the same way. In a single-cell form, fungi and algae qualify as self-sufficient microbes.

Animal cells are typically specialized and dependent on a support framework. Usually, a single animal cell left out on its own is largely doomed.

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  • $\begingroup$ And egg is an animal cell and usually left out in case of reptiles and mammals $\endgroup$
    – user154547
    Nov 2, 2018 at 4:31
  • $\begingroup$ *avians ..not mammals /sorry $\endgroup$
    – user154547
    Nov 2, 2018 at 4:31
  • $\begingroup$ Most eggs need to be tended to regularly, watched over, kept warm, or placed in a specific environment, which arguably serves as a "support framework" $\endgroup$ May 3, 2019 at 20:28

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