Select the sentence in this passage that can be classified as a false statement. Although few humans per year are attacked by polar bears, any individual attack can be terrifying and even fatal. The warming of Arctic regions has allowed the intrusion of humans into the polar bears’ habitat, increasing the danger of harmful contacts. Remaining alert and using precautions can help humans avoid a negative encounter with a polar bear. Traveling together and staying close to the group can help humans avoid bear attacks. Certain weapons, including nonlethal ones such as pepper spray, are effective against polar bears. Once a bear has decided to attack, however, nothing can be done.