Answer:
"Matter" it has mass and it takes up space.
Processes like deforesstation can bring an enviromental change in which it is harmful but afforestion is another form which bring the enviroment in to a better situation
Humans can live depending on certain circumstances of the water and energy level but realistically it’s not possible . Water concentration would be hard for us to take in , considering the amount of oxygen we have in and take in it wouldn’t last as much as a certain time being in the water. We would have to consider how deep we can live in , how much oxygen and energy level there is to be able to live in water.
They are plants without a vascular system
