rainfall amounts each week tiny organisms in pond water the high temperatures each day the amount of growth in a plant
I gave my students this multiple choice question: Russell wants to observe changes in nature over the next few months. What can a thermometer help Russell investigate?

Only one answer is correct among these 4 choices:
- rainfall amounts each week
- tiny organisms in pond water
- the high temperatures each day
- the amount of growth in a plant

Could you tell me which one is correct?

the high temperatures each day