Answer :
Answer:
Leave empty
Explanation:
Water is uncountable, so definitely not "a" or "an".
We're left with either leaving it empty or "the". But "the" suggests that it's not just any water, but some type/body of water in particular, which is not the case.
Water is essential to life.
Answer:
To stay alive, the organism takes in important materials for making energy, while shuttling out toxic substances such as waste products. In this regard, water is essential simply because it's a liquid at Earth-like temperatures.