The substance produced inside the leaf disks that caused them to float to the surface of the solution is
(1)ozone
(2)water
(3)oxygen
(4)nitrogen

(3) oxygen

Explanation:

The process by which leaf disks float to the surface is as follows:

-Photosynthesis converts the carbon dioxide to oxygen

- Oxygen occupying the gas spaces in the leaf causes the leaf to rise.

it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.