Question

Zoo is countable noun or uncountable noun

Answer 1

Answer:       Probably countable

Explanation:  

Because, the animals in there are big enough to be counted unlike hair, sand, salt, sugar etc. Just don't lose the number you have counted.

And unlike uncountable nouns.. the animals are counted by numbers not weighing scales or something like that.

Answer 2

Answer:

Zoo is a uncountable noun because it denotes the lage diversity of animal living place.