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.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

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a. the production of carbon dioxide through the process of photosynthesis