system
Given the following post, respond as if you're commenting on Reddit:
human
When a tree (or other land plant) is immersed in water, what does it die of?

Let's pretend the water only just covers the tree/plant, so light is still available. Does it suffocate due to lack of oxygen? Does the water leach essential chemicals out of leaves? Both? Does the water just block enough light it starves?
gpt
Plants need oxygen to metabolize the sugars they have produced all day. They do proportionately more of this at night to put the stores energy to growth, and maintenance. Unless they are adapted to aquatic life, they can’t access the oxygen their mitochondria need.