Could Mars Support Life?
ESU701  Supporting Life

Earth is the only planet on which we know life exists. How do interactions of Earth's atmosphere, hydrosphere, geosphere, and biosphere make life possible?

  !   Examine these two views of Earth and consider how our planet supports life.

NASA and Joseph R. McAuliffe
Earth from space and on the surface.

1. List at least two factors that make life possible on Earth.

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