Answer:
a pond of water drying out due to changes in average temperature
During this time the sun is closer to the earth in its yearly revolution around the sun. In winter another place on earch is hotter because it is closer than we are.
Answer:
The temperature is kept at room temperature and mostly preferred to be constant, so that the temperature does't be a variable factor effecting the accuracy of experiment.
Temperature is kept constant to take it as a control factor, so that experimental results are not effected by such outside factors. Such control variables are important in experiments as they minimize the influences from outside.
I'm pretty sure it would be 50%
