the pH of the water the clarity of the water the pressure of the water the temperature of the water
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A daphnia population shows a vertical migration from the bottom of a one-meter-deep pond during the day to the surface of the pond at night. To which factor is the daphnia population most likely responding?
Possibilities:
- the pH of the water
- the clarity of the water
- the pressure of the water
- the temperature of the water

the temperature of the water