He is participating in the antinuclear movement.

Insects have an exoskeleton, which protects their body.

The human endoskeleton is made up of 206 bones.

He passed the book to me.

Due to overfishing, there is a possibility that the marine ecosystem could be destroyed.

The problem of overfishing is having a serious impact on marine ecosystems.

We need a change in the education system.

His elative is respected by the other members.

He prepared himself for the exam.

On a hot day, crushed ice is the best.