My brother has always cared about nature. Last year, he went on a trip to the Arctic. He took many photos of polar bears. He was very brave because polar bears can be very fierce if they think their cubs are in danger. However, my brother went there because the polar bears are also threatened with ___, and he wanted people to know how beautiful they are. He also said it was freezing cold, but my brother has always been very adaptable to different environments. Indeed, he never had problems If we moved house when we were young. I admire him because he never worries about anything, and always puts the interests of others before himself.