The study of chromosomes is an important part of genetics.

There are several misprints in this book.

He is in a sinecure.

His painting has a unique stroke, and you can recognize it at a glance.

He showed his true colors under difficult circumstances.

I heard the croaking of the rain frog and felt the arrival of spring.

He was exempted from military service for health reasons.

He changed his clothes immediately after exercising at the gym.

Uriel plays an important role in Jewish tradition.

We will use ethanol in this experiment.