(2)Plants and animals would most likely be fossils regarding the needs and wants of the species. I think plants would not last but there is a slight chance animals would survive but like humans they would not last very long.
(3)Be clean and cautious about garbage and be environmentally friendly so that are water is fresh and clean.
(4)It is a very important role in life and earth so it is easy to talk about and have a conversation.
(5)It is important that they study water so they can see if it is clean and healthy for human consumption.