Astudent is conducting an experiment to determine how cold temperatures affect the growth of tadpoles in a tank of water. which instrument would give the most accurate measurement of water temperature? a calibrated bulb thermometer that has a readout from 15 c to 25 c a calibrated digital thermometer that has a readout from 50 c to 250 c an uncalibrated bulb thermometer that has a readout from 0 c to 100 c an uncalibrated digital thermometer that has a readout from 10 c to 100 c

The instrument that would provide the student with the most accurate measurement of water temperature is a calibrated bulb thermometer, which has a readout from 15 degrees C to 25 degrees C.  

Calibration illustrates the quality and precision of measurements recorded using a piece of equipment. The aim of calibration is to reduce any measurement uncertainty by making sure the accuracy of test equipment. Calibration monitors and quantifies the uncertainties or errors within a measurement procedure to an acceptable level.  

 For reading temperatures of cold water, the most appropiate instrument is a a calibrated bulb thermometer that has a readout from 15 C to 25 C a calibrated digital

Explanation:

Among all the options, the most accurate termometer is  a calibrated digital thermometer, however, we have to keep in mind the student´s experiment , and he needs to read cold temperatures instead of hot temperatures; finally the most useful termometer giving the current experiment is the calibrated bulb thermometer, because  its readings are reliable, considering that is already calibrated under the range of temperatures that the study is taking place.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.