Theoretically a lot of Earth pines would survive on Mars, given water. They are an OLDE species, and their tolerance for cold is phenomenal. They spit the water out of their cells when it gets to freezing temperatures, and basically turn their trunks into a block of tree ice.
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<3 I don't think that reverance or respect for the dead needs the dead to be hidden from sight completely. It is the attitude that you bring, as a witness to a dead body, that matters, not the display and witnessing of a dead body, per se.