Why does the nettle plant have spines to protect it against animals?

The nettle plant has spines, or stinging hairs, as a defense mechanism against herbivores. These spines contain a mixture of irritating compounds that can cause pain and discomfort when touched, deterring animals from eating the plant. By discouraging herbivory, nettles can better survive and thrive in their environment, ensuring their reproductive success. This adaptation is a common strategy among many plants to protect themselves from potential threats.