Why scientists use tools ,such as thermometers and metersticks, when they make observations

The correct answer will be- to make accurate observations and verify their results.

Explanation:

In a scientific method, making an observation is the first step to follow which is done by the sensory organs of the body. But the development in science has produced new tools which have helped humans to improve their observations.

The use of thermometers and meter sticks are used while making an observation as these tools improve the accuracy of the observations as well as these tools are used to verify the answers or observations by another person at any time.

velocity and height

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."