Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

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What type of organism is a barnacle?

Insect
Fish
Reptile
Mollusk

The correct answer is: Mollusk

A barnacle is classified as a mollusk due to its characteristics and anatomical features. Mollusks are invertebrate animals that have a soft, unsegmented body, a muscular foot, and usually a shell. Unlike insects, barnacles do not have jointed legs or wings. They also do not have the typical features of fish, such as scales, gills, or a backbone. As for reptiles, barnacles do not possess any of their defining traits, such as a shelled egg, dry skin, or cold-blooded metabolism. Therefore, the best answer for the type of organism a barnacle is, is a mollusk.