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The most basic food essential for human survival is water.
No, killing the pig is not essential to the survival of the group. There are other ways to obtain food and resources for survival without harming animals.
Reproduction
yes
The organ essential for human survival that cannot be lived without is the heart.
However, volcanoes are essential to earths survival they act like a safety valve for the planet (it releases pressure)
Chlorine.
Hansen
to ensure the survival of a species.
a need
Three basic necessities that are essential to human survival are food, shelter and water
You can live without your spleen, as it is not essential for survival.