An Adult Animal That Possesses Bilateral Symmetry is Most Certainly

Question

An adult animal that possesses bilateral symmetry is most certainly also
A) triploblastic.
B) a deuterostome.
C) eucoelomate.
D) highly cephalized.

Accepted Answer

Bilateral symmetry is a characteristic of triploblastic animals, which means they have three germ layers during development. Bilateral symmetry, in general, divides the body into left and right equal halves along a distinct line, which is helpful for assisting with efficient movement, sensing the environment, and maintaining balance.

Answer: C 
 Eucoelomate animals possess a true body cavity referring to coelom development. Triploblastic animals develop the coelom in different ways which can lead to different organisms categorized as pseudocoelomate or eucoelomate. Bilateral symmetry can be found in both eucoelomate and pseudocoelomate animals.

The other answer options are not correct because:

Option B: A bilaterally symmetrical animal need not be a deuterostome. Both protostomes and deuterostomes can possess bilateral symmetry as an inherent characteristic.

Option D: Bilateral symmetry does not require cephalization, as evidenced by organisms like flatworms, which possess bilaterally symmetrical bodies but lack clear heads or brains.