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The zone that would be most difficult for a plant to live in is the Benthic zone. It is the zone at the lowest level of a body of water.
The most studied plant on planet earth is cannabis.
85% of all plants on the earth live under the sea! Most plants grow from seeds!
It is one of the most difficult places to live in. It is the most coldest place on earth so you can just about imagine how tough it is.
Grass
Because we live on it, basically. Most of us also want to leave it in reasonable condition for our children and grandchildren. If we don't stop global warming, the earth is going to be very difficult to live on in 100 years time!
Most humans live of the crust of the Earth.
Aspen tree
pluto
cellulose
Alaska.
now how