A- organelles can have more than one role
A, electro magnetic is not a form of potentional energy
Scientific knowledge is durable and robust, but open to change.
Hope this helps
The hours of daylight and dark time depends on where you are but how many snails and plants it takes to keep a stable environment my guess would be a few thousand snails and a couple thousand plants and also they have to be different kind of plants of so they can benefit from each other all around.
