Monitor is a concrete noun.
A concrete noun is something material. Basically, just remember that if you can touch it, it's concrete!
Abstract nouns are usually feelings, such as anger, happiness, sadness. If you can't touch it, it's abstract!
If you have any questions about how to differentiate concrete and abstract nouns, just ask!
Good luck :))
Answer:
a tree has a thick trunk
Explanation:
This adaptation helped it survive strong winds and tropical stoms
The introduction would begin a play.