Most rainforests too degraded to provide good habitats 多数雨林退化严重而无法为 ...
Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.
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精子竞争：自然选择中的微观战争
在自然界中，雄性为了繁衍后代，不仅需要与其他雄性竞争交配机会，甚至在成功交配后，精子也必须与其他雄性的精子在雌性的生殖道内展开激烈的竞争。精子竞争（sperm ...