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| 提交者: | 时间:2019-06-20 19:50:01
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| 附注: | | US dollars planetsuzy porndude Just after the whale reached sexual maturity, the earplug shows that the animal experienced peak levels of cortisol, a stress hormone. It芒聙聶s likely that competition with other males triggered high levels of stress in the whale during its first breeding season. The whale芒聙聶s overall cortisol levels doubled over its lifetime, although the researchers aren芒聙聶t sure what to ascribe this to; it could be due to behavioral factors such as weaning, ecological factors like decreasing food availability, or environmental factors such as intensifying boat noise.
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