Protectionist policies are introduced to protect domestic industries from foreign competition.

He committed another crime while on probation.

The ship entered the port flying a quarantine flag.

This sanctuary plays a crucial role as a habitat for endangered species.

She was raised by an overprotective mother.

She was raised by overprotective parents.

The activity of brain cells directly affects our thoughts and actions.

Cytology is a branch of biology that studies the structure and function of cells.

Stem cell research is opening up new frontiers in medicine.

The cell nucleus holds genetic information.