The animal kingdom is incredibly diverse, and it is said that there are still species that have not been discovered.

The animal kingdom is known for its diversity and complexity.

He emphasized his belief by saying, 'I believe in order to understand.'

She described the pain of a broken heart as tears.

I don't know a thing about him.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

Cnidarians are a type of marine life, including jellyfish and corals.

We went to the petting zoo on the weekend.

The ecosystem of zoobenthos is an important field of study in marine biology.

Echinoderms are a type of marine life, many of which have star-shaped bodies.