Question

multiple choice question
animals with ______ have anterior (head) and posterior (tail) ends.
pentaradial symmetry
radial symmetry
bilateral symmetry
asymmetry

Explanation:

• Pentaradial symmetry is mainly seen in echinoderms and is a type of radial symmetry with five - part symmetry. It does not have distinct anterior and posterior ends.
• Radial symmetry means that the body can be divided into similar halves around a central axis. Organisms with radial symmetry (like jellyfish) do not have a clear anterior (head) and posterior (tail) distinction.
• Bilateral symmetry implies that the body can be divided into two mirror - image halves along a single plane. In bilaterally symmetrical animals, there is a clear differentiation of anterior (head) and posterior (tail) ends. For example, in humans, the head is the anterior end and the lower back/buttocks region (towards the tailbone in the evolutionary sense) is the posterior end.
• Asymmetry means that the body cannot be divided into similar halves. Asymmetrical organisms also do not have a defined anterior - posterior axis.

Answer:

bilateral symmetry