Which external covering characterizes most fish species?

Which external covering characterizes most fish species?

• A. Fur
• B. Hair
• C. Scales
• D. Feathers

Answer: (C)

External coverings in vertebrates vary, and for fish the defining covering is scales. These protective plates sit over the skin and often overlap, reducing damage and helping streamline movement through water. Scales can be of different types but share the function of shielding the body while aiding efficient swimming. In contrast, fur and hair are mammalian features produced by hair follicles, and feathers are bird-specific keratin structures. Since fish commonly have scales, scales are the external covering that characterizes most fish species.

External coverings in vertebrates vary, and for fish the defining covering is scales. These protective plates sit over the skin and often overlap, reducing damage and helping streamline movement through water. Scales can be of different types but share the function of shielding the body while aiding efficient swimming. In contrast, fur and hair are mammalian features produced by hair follicles, and feathers are bird-specific keratin structures. Since fish commonly have scales, scales are the external covering that characterizes most fish species.