system
Given the following post, respond as if you're commenting on Reddit:
human
How do trees survive freezing temperatures? Does the water in them not freeze?
gpt
water does freeze in trees, and it's a problem that trees tackle by expelling water outside their cells' walls (cells die if water freezes in them and expands enough to break the cell apart). 

then trees go into a hibernation mode, slowing down most processes to a bare minimum, working around the problem of water loss.

conifer trees tend to be more sturdy and their cells can withstand some serious pressure from the ice crystals even if they do form inside the tree's cells or tubes.

therefore, conifers generally don't "shut down" during winter completely and are built to resume operations even during short thaw periods. after all, they keep their needles (which are less prone to water loss (through evaporation/sublimation) than leaves), so they can photosynthesize, ie. create energy to keep them going throughout winter.