Here is the sentence from the test
Without the Sun there _____________ no light, no heat, no energy of any kind.
a) will be
b) would be
The answer is obviously "b" because it is second conditional. However in another sentence
Oxygen is an element of greatest importance to the Earth as all living things __________ without it.
a) would die
b) will die
c) will be dying
the correct answer is "b" and not "a". I don't understand why, because both sentences are constructed similarly, even the "without" preposition appears in both of them.