I had found this answer off of another question so the credit does not really go to me but the person that wrote this. Btw if you actually wrote this question down you could’ve found a answer without asking a question. Hope this helps
<span>Various different electric telegraph systems. Morse's was not the first, just the one that succeeded in the market.
source: www.answers.com</span>
Answer:
It depends if you know if Isaac is a real human or not...
Explanation:
A concrete noun refers to a physical object in the real world, such as a dog, a ball, or an ice cream cone. An abstract noun refers to an idea or concept that does not exist in the real world and cannot be touched, like freedom, sadness, or permission.