Advntage:
provides CPU scheduling, memory management, file management, and other operating system functions through system calls. The other one is that it is a single large process running entirely in a single address space.
Disadvantage: if anyone service fails it leads to an entire system failure
It really depends on what you're using it for such as looking up a recipe or an answer to a question. If you're using it for illegal purposes or looking up things that are seen as morally wrong by other people it can make the internet seem like a bad thing. But the internet wasn't created with that intended purpose so again it's just your own personal opinion.
All of them are available
For numb in [5,8]:
for numa in [2,3]:
print(str(numb) + str(numa))