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The hypothesis that Mars may once have had the conditions needed to support life is based in part on _____.
evidence that liquid water was once present
its similar size and temperature range to Earth
its thick, oxygen-rich atmosphere
the system of canals seen by Schiaparelli
Evidence that liquid water was once present.
18.
Astronauts that travel into space face _____.
conditions very different from on Earth
challenges that, as of now, cannot be overcome
conditions very similar to those on Earth
challenges that are easy to overcome by scientists
Conditions very different from on Earth.
Meteorites from Mars have been found _____.
floating in the ocean
embedded in northern glaciers
lying on Antarctica’s ice
on the ocean floor
BOT ANSWER IT
Meteorites from Mars have been found lying on Antarctica’s ice.
20.
Astronauts in orbit feel weightless because _____.
they have no mass in space like they do on Earth
they have negative weight in space
they are falling through space around Earth
there is no gravity in space