There are some very large single celled organisms that aren’t eggs. E.g.: https://en.wikipedia.org/wiki/Valonia_ventricosa https://en.wikipedia.org/wiki/Valon

There are some very large single celled organisms that aren’t eggs. E.g.: https://en.wikipedia.org/wiki/Valonia_ventricosa https://en.wikipedia.org/wiki/Valonia_ventricosa https://en.wikipedia.org/wiki/Foraminifera https://en.wikipedia.org/wiki/Foraminifera Even some bacteria can grow to visible size: https://en.wikipedia.org/wiki/Thiomargarita_magnifica https://en.wikipedia.org/wiki/Thiomargarita_magnifica There are some other examples here: https://en.wikipedia.org/wiki/Largest_organisms https://en.wikipedia.org/wiki/Largest_organisms