Final answer:
A high-precision temperature probe is the best choice for Dr. Nkembe's research due to its accuracy in measuring small temperature variations, which is crucial for studying the effect of temperature on biological processes like plant toxicity and metabolism.
Step-by-step explanation:
The best choice of thermometer for Dr. Noa Nkembe's research on the effects of temperature on the toxicity of Toxicodendron diversilobum would be a high-precision temperature probe. This is because a temperature probe is typically more accurate than a glass thermometer or temperature strip, especially when measuring within very narrow ranges such as a variation of 0.05 degrees Celsius.
Temperature probes can be connected to digital readouts that provide precise measurements and can often be calibrated for increased accuracy. Seeing as metabolic rates and other biological processes are sensitive to temperature changes, having the most accurate tool is essential for the validity of the research conducted.