GED Science Practice

What is the characteristic of an arthropod?

1. No appendages

2. No exoskeleton

3. No bilateral symmetry

4. No reproduction sexually

The correct answer is: No bilateral symmetry

The correct answer highlights that arthropods are characterized by having bilateral symmetry, which means their body can be divided into two identical halves on either side of a central axis. This trait is common among many animals, enabling them to have distinct left and right sides, which is crucial for their movement and organ function. Arthropods, which include insects, arachnids, and crustaceans, all display this form of symmetry. It contributes to their highly organized body structure, with a well-defined head, thorax, and abdomen in many cases. The presence of bilateral symmetry is important for evolutionary advantages, such as efficient movement and the ability to develop specialized body parts. The other options refer to characteristics that do not apply to arthropods. For instance, arthropods are distinguished by having jointed appendages and an exoskeleton, which are key features of their anatomy. Additionally, arthropods reproduce both sexually and asexually, depending on the species. Hence, the statement about lacking sexual reproduction is inaccurate with respect to their biology.