Concept:The image shows a fish, which is a vertebrate animal.
Explanation:The organism in the image has a backbone, scales, and fins, which are features of a vertebrate.
All vertebrates are placed in the phylum Chordata.
It is not Nematoda because that phylum contains roundworms.
It is not Porifera because that phylum contains sponges.
It is not Annelida because that phylum contains segmented worms.
Therefore, the fish is classified under phylum Chordata.
Answer:B. Chordata
