What is the effect of gatsby reaching through the dark setting toward the light

It's to know your purpose before you read something because a purpose can:

Ineed ,someone me on this and my other questions

During an experiment measuring the change in temperature of a chemical reaction your digital thermometer breaks. you have the same model thermometer available to use how do you proceed with the experiment a. continue on with the new thermometer b. begin the experiment again with the new thermometer c. calibrate the new thermometer and make a notation regarding the change in equipment d. calibrate the new thermometer and begin the experiment again