Professor tan studies water quality in streams near chemical plants. which is a type of qualitative data that professor tan
should record during these studies?
the ph of the water
any occurrences of unusual odors
the oxygen concentration of the water
any changes in sizes of fish population
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any occurrences of unusual odors

Explanation:

One thing that separates quantitative and qualitative data is that quantitative data are "quantities" so this means that they can be measured. Qualitative data are descriptors or more categorical. Examples would be properties, characteristics, attributes, and the like.  

In the scenario, pH, O2 concentration, sizes of fish populaftion are all measurable.  However, odors are not measured, they are descibed or categorized.

The best answer would then be, "any occurences of unusual odors."

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.

credit: gradman555p98x9p

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i am positive it is c. condensing but i may be wrong