What does entrenched mean?

Unable to change a person's thought or way of thinking.

Explanation:

Depends on the context.

In warfare?

There are soldiers taking up a fortified position in which soldiers are awaiting the enemy to advance so they can mow them down. It is usually a term used in warfare.

In arguments?

Yeah. They're not gonna change their view. Good luck trying.

All in all hope this helps

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

hope this !

b - those executed came from every social and economic class