Question

Choose the phylum that has subcategories:

• A. Arthropoda
• B. Mollusca
• C. Platyhelminthes
• D. Chordata

Answer 1

Answer: (A), (D)

Chordata

The correct option is A and D.

Explanation of the correct option:

1. Animals that have been successful in colonizing terrestrial, aquatic, and aerial habitats belong to the phylum Arthropoda.
2. The animal kingdom's largest phylum contains well-known species like centipedes, millipedes, spiders, mites, insects, and lobsters.
3. Most arthropods are small animals.
4. Arthropods are the only invertebrates that can fly, yet only aquatic varieties can grow to significant sizes.
5. The prevailing view holds that the phylum Chordata consists of three subphyla: Urochordata (Tunicata), Cephalochordata, and Vertebrata.
6. All three groups are characterized by the possession of a notochord, a dorsal, hollow neural tube (nerve cord), branchial slits, an endostyle, myotomes, and a postanal tail

Explanation of the incorrect option:

Option B:

1. With at least 50,000 living species, the molluscan order of animals is one of the most varied on the world (and more likely around 200,000).
2. It includes well-known creatures including clams, scallops, oysters, chitons, octopuses, and squid.

Option C:

1. Any member of the phylum flatworm, commonly known as platyhelminth Platyhelminthes are a class of invertebrates with soft bodies that are typically very flattened.
2. There are several free-living flatworm species, but around 80% of all flatworms are parasitic, meaning they live on or in another organism and get their nutrition from it.

Final answer: Phylum with subcategories is Arthropoda and Chordata.