Amoeba

I feel like an amoeba.

This rare brain-eating amoeba travels up the nose to the brain and starts eating it.

An amoeba is animalcular.

An amoeba is a protozoan.

The English word "amoeba" and the Japanese word "tatoeba" don't rhyme.

The amoeba is a unicellular organism.

The amoeba is a single-celled organism.

The amoeba is a protozoon.

The amoeba is a protozoan.

I'm an amoeba.