He is collecting a hundred old coins.

He solved a hundred problems.

It's a hundred meters from my house to school.

A fear called '慄' was floating in his eyes.

I saw many animals at the zoo.

Vertebrates are organisms whose part of the skeleton is composed of a spine.

Wild animals are part of nature, and we should protect them.

He is majoring in zoology at university.

Arthropods are a large group of animals that include insects, spiders, and shrimp.

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