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How do horns differ from antlers in horned mammals?

  1. Horns are shed every year

  2. Horns grow continuously throughout life

  3. Horns are only found in males

  4. Horns are made of cartilage

The correct answer is: Horns grow continuously throughout life

Horns differ from antlers primarily in that they grow continuously throughout the life of the animal. This characteristic is key to understanding how horns function in horned mammals. Unlike antlers, which are shed and regrown annually, horns maintain their structure and grow incrementally over time. Horns are typically composed of a bony core covered by a sheath of keratin, which is the same protein found in human hair and nails. This continual growth allows them to serve various purposes, including defense, social signaling, and combat during mating rituals. It's also important to note that horns are found in both male and female species of certain families, like cattle, which contrasts with antlers that are primarily associated with males. This distinction further emphasizes the biological and functional differences between the two structures. Understanding these aspects helps clarify the unique role that horns play in the lives of horned mammals.