Its a special processes in the water cycle called transpiration.
Mutualism is where both animal help each other to benefit form each other. Win-Win . Commensalism is where nothing happen neither animal benefits from it .
I can't answer that perfectly, as there is a leap year every four years, but it should be 5,479 days. (365*15 + 4)
The cloud is white, and looks like cotton candy
sometimes the cloud become grey when there is no sun
when is it raining, it become totally dark