Animal experiments are necessary for the advancement of science, but there are also ethical issues.

He is learning about the handling of experimental animals.

Roundworms are an important part of the soil and contribute greatly to the health and fertility of the soil.

He is a world-renowned zoologist.

My pet is a dog.

I avoid eating animal products.

Protozoans are single-celled organisms.

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

He is deeply involved in the animal liberation movement.

We went to the zoo with our family on the weekend.