Answer the following question: You are presented with the quiz "Why do animals adapt?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "animals adapt to cold temperatures" and "extremes in temperature can kill animals". So, what's the best answer to the question?

Available options:
1). survive;
2). To live shorter lives;
3). dry conditions;
4). To stay weak;
5). To make money;
6). the environment;
7). allow growth;
8). To avoid death;
Answer:
8).