Water is more of a radical it brings moisture and it has great power in its surf clouds are made from the moisture water is like a power sorce for storms and other things
When i observe internal parts of plants , i feel that its structure and functions are very complex and dependent from one another
If one part of the plants fail to do its function, it will be most likely that other parts of the plants will be disturbed too
hope this helps
I would say communication, as neurons transmits messages from one part to another part of the body
