Question

Consider the following features about a certain animal group/groups?

Select the correct option of animal groups that possess all the above characteristics.

• A. Annelida, Arthropoda, and Chordata
• B. Annelida, Arthropoda, and Mollusca
• C. Arthropoda, Mollusca, and Chordata
• D. Annelida, Mollusca and Chordata

Answer 1

The correct option is A

Annelida, Arthropoda, and Chordata

The correct option is A.

Explanation for correct answer:

1. The organ-level system of organization is when two or more tissues work together to carry out a specific function.
2. Bilateral symmetry is when similar anatomical parts are arranged on the opposite sides of the median axis and a plane can divide an individual into identical halves.
3. The true coelom is the presence of a body cavity formed during embryo development from the three germinal layers.
4. Annelida is a phylum that includes invertebrates characterized by the presence of a body cavity, movable bristles, and a body segmented by transverse rings.
5. The phylum arthropods include animals that have a hard exoskeleton and joint appendages.
6. Their body is segmented, bilaterally symmetrical, and has an open circulatory system.
7. Chordata includes organisms that have a notochord, a dorsal hollow nerve cord, pharyngeal slits, and an anal tail.

Explanation for incorrect options:

Option B:

1. Mollusca includes animals such as clams, snails, slugs, and squid.
2. They have soft bodies that are bilaterally symmetrical and coelomate.

Option C:

1. Mollusca includes animals such as clams, snails, slugs, and squid.
2. They have soft bodies that are bilaterally symmetrical and coelomate.

Option D:

1. Mollusca includes animals such as clams, snails, slugs, and squid.
2. They have soft bodies that are bilaterally symmetrical and coelomate.

Final answer: Annelida, Arthropoda, and Chordata possess all the above characteristics.