Question

a single -celled living thing

Answer 1

A single celled living thing is called Unicellular organism

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Answer 2

$\huge\mathbb\red{Salut\:Mate}$

Here is your required answer,

▶️ A single-celled living thing is known as $\small\bold{Unicellular\: Organism.}$

For example, PPLO etc.

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