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.

I avoid eating animal products.

He is deeply involved in the animal liberation movement.

Protozoans are single-celled organisms.

As the name suggests, chordates are a group of animals that have a notochord.

Gender identity refers to the gender that each individual recognizes themselves as.

The mayor issued a curfew at night due to an emergency.

He is undergoing training for extravehicular activity.

He engaged in an extravehicular activity from the spaceship.