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."

1. glaciers are melting

2. more water going into ocean (water's such as fresh waters, etc)

one centimetre is equal to 0.01 metres