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There's two answers depending on how you define "cell":
An unfertilized ostrich egg
Gromia sphaerica

The ostrich egg is up to 3.3lbs and about 6 inches x 5 inches. However, the unfertilized egg is an evolutionary dead end that doesn't intake food, excrete waste, reproduce or move (it isn't a functioning cell).

A amoeba, the grape-sized Gromia sphaerica (3 centimeters or 1.2 inches long) is the best current answer.

Largest bacteria is Thiomargarita namibiensis, which means "Sulfur Pearl of Namibia" which can reach up to 0.75 mm long (a little larger than the period at the end of this line).

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16y ago

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