Refer to this portion of a dichotomous key for fish identification to answer the question. According to this dichotomous key, any catfish must have

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

what is shown in the image?

eukaryote

chloroplast

mitochondrion

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