2 Complete the text with the words in the box. C habitat live swim climate extinct pollution hunt 6 3 Polar bears are becoming. Why? Human 2 is changing the _. Polar bears 4 on the ice in the Arctic. But the ice is melting and their 5 _ is getting smaller. Every year it gets more difficult for the bears to 6_seals. Polar bears can'_but they can't live in the sea! 5