The police strengthened security to prevent unauthorized entry into the building.

He entered my room without permission.

I am interested in Dutch studies.

The market fell into confusion due to that news.

Every year, many fish gather in this river for spawning.

Frogs spawn when spring comes.

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

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

This room is in a state of dispersion with things scattered around, and it needs cleaning.

His room was scattered with books.