4. one kind of fish, the hagfish, is considered an invertebrate by scientists. why is this fish an invertebrate whereas all other fish are vertebrates?

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

i think that it is plants

protistas excret ethanol used in the manufacture of vinegar

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.