It can be because there are some parts around that arent getting water
Answer:
still 9 and 11. No operations are happening
Explanation:
The correct answer is C.
In the aquarium, the water plants would provide the O2 molecules necessary for the snail's metabolism and the snail would release the CO2 molecules that are a byproduct of his metabolism into the container. The CO2 would later be used by plants to make sugar in the process of photosynthesis, releasing more O2 and the cycle of two gases would be completed.
It is there in case a circuit may not work or water may have entered the circuit they can reset or cut off the switch to get rid of the water.
