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Option 1: "We used to think that animals have friends only for biological reasons but we are discovering that animals can also have friends like humans can, and can sometimes have friends from different species."
Explanation: This option accurately captures the main idea of the text, which discusses the evolving understanding of animal friendships. The text states that while animals were thought to form friendships solely for biological reasons, there is now evidence suggesting that they can form friendships similar to humans, including friendships across different species. This reflects the thesis of the text, which emphasizes the complexity of animal relationships beyond mere survival.
Option 2: "We used to think that animals have friends only for biological reasons because we focused too much on how animals need to survive with the help of another animal."
Explanation: This option is incorrect because it suggests that the previous belief about animal friendships was solely due to a focus on survival. While the text mentions biological reasons for friendships, it also highlights the new understanding that animals can be generous and form friendships without expecting anything in return. This option does not encompass the broader implications of the text.
Option 3: "We used to think that animals have friends only for biological reasons because they are unable to be generous and give up something important for a friend without expecting anything back from them."
Explanation: This option is incorrect as it misrepresents the text's message. The text explicitly states that animals can indeed be generous and can give up something important for a friend without expecting anything in return. Therefore, this option contradicts the information presented in the text.
Option 4: "We used to think that animals have friends only for biological reasons but now we know this is not entirely true, however, animals cannot have friends from different species."
Explanation: This option is incorrect because it contradicts the text's assertion that animals can have friendships across different species. The text emphasizes that there is growing evidence of such interspecies friendships, which this option denies. Thus, it fails to accurately summarize the content of the text.
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