Water:
70% of our body is water.
>> 70% of humans are made up of water.
So we can't live without water, we die if we don't drink water or eat foods for 3 days or more.
>> So we can't live without water, we will die if we don't drink water or eat food for 3 or more days.
Land:
We can't live without Land because if we don't have Land, we have to live in the space.
>> We can't live without land because if there's no land, we will have to in the space.
But we will die because we can't breath.
>> but we will die in the space because there is no oxygen.