"but" is the conjunction in this sentence because it is responsible for joining the two clauses "I would like to go to the circus" and "I do not have enough money for a ticket." A fun way to remember the conjunctions is the acronym FANBOYS.
For
And
Nor
But
Or
Yet
So
Hope this helps!
Explanation:
Don't want to go through in life
I'm assuming it is from the book Animal Farm? If so, it was Old Major the white boar.