Continuity mistake: In every view of the front of Mars 1, you can clearly see the landing pod still attached, even when it's on Mars' surface.

Red Planet (2000)
Ending / spoiler
Directed by: Antony Hoffman
Starring: Val Kilmer, Terence Stamp, Tom Sizemore, Benjamin Bratt, Carrie-Anne Moss, Simon Baker
The space crew dudes can breathe on Mars because of these insects that eat algae and exhale oxygen. Gallagher (Val Kilmer) outsmarts the robot AIMEE, sets it on fire and takes its battery in order to power up the old Russian ship that he uses to leave Mars. Bowman (Carrie Anne Moss) rescues Gallagher as he's entering the Mars orbit and they study the Mars insects that Burchenal (Tom Sizemore) stored in a tube before dying.
Truman
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Chosen answer: They aren't given a name. They act like plants, except instead of absorbing carbon dioxide and expelling it as oxygen, they eat plants and release oxygen from their bodies. It's probably more effective than using plants since they weren't expecting to be able to breathe on the surface.
Knever