After the volcano erupted, the entire town was covered in ash and dust.

He is an Arab and very kind.

His words steadily resonated in my heart.

The prevention of venereal diseases is most important in safe sexual behavior.

Reverse Polish notation is one method of expressing calculations.

This check valve has the role of preventing water from flowing backwards.

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

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

A tardigrade can survive in extreme environments.

Invertebrates are a type of creature without a skeleton.