**CORRECT ANSWER Mercury's perpetually cold "dark side" retains a thin carbon dioxide atmosphere Earth's atmospheric nitrogen, unlike its water, originated from volcanic outgasing All of these suggest that Mars may have or could have hosted life at one time, EXCEPT... surface features suggestive of the presence of liquid water in the past evidence of a denser atmosphere at that time strange features in Mars-originating meteorites that have landed on earth surface features that were almost certainly constructed by intelligent beings
(CORRECT ANSWER Mercury's perpetually cold "dark side; retains; a thin carbon dioxide atmosphere) (Mars-originating meteorites; have landed; L:on earth surface features) (earth surface features; were almost certainly constructed; by intelligent beings) (All of these; suggest; that Mars may have or could have hosted life at one time, EXCEPT... surface features suggestive of the presence of liquid water in the past evidence of a denser atmosphere at that time) Context(All of these suggest,List([180, 200))):(Mars; may have; ) (Mars; could have hosted; life; T:at one time)
All of these suggest,List([180, 200))
CORRECT ANSWER Mercury's perpetually cold "dark side Mars-originating meteorites earth surface features All of these Mars Mars
retains have landed were almost certainly constructed suggest may have could have hosted
a thin carbon dioxide atmosphere
L:on earth surface features
by intelligent beings
that Mars may have or could have hosted life at one time, EXCEPT... surface features suggestive of the presence of liquid water in the past evidence of a denser atmosphere at that time
life T:at one time