Hierarchical Classification
The levels of classification he used are: kingdom, phylum, class, order, family, genus, and species. You can see that genus and species are the two most specific categories, which is why they are used in binomial nomenclature to identify an organism.
Answer: I am pretty sure that it is A
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Explanation:
I think it is Sulfur Dioxide (SO2) and Nitrogen Oxides (NOX).
Answer:
It's obvious.
option b. and d.
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