A tapeworm is a parasite that lives inside the human body.

He found out that there was a foreign object inside his body.

Parasites live inside the host's body and steal nutrients.

He is living a simple life.

This world where people live is beautiful, and sometimes harsh.

Humans can make mistakes.

This old document details the lifestyle of humans.

My life has become busy recently.

My biological clock is completely messed up.

I am majoring in parasitology at university.