1. Accurate estimates of female-to-male cost ratios are essential for testing theories about kin selection and worker control over sexual investments in an... JJ Boomsma,LKG Nielsen - 《Functional Ecology》 被引量: 152发表: 1995年 Sex ratios in bumble bees The median proportion of investment...
Well, as it turns out, they have everything to do with sex. But to understand that, you first need to know the history of how mitochondria came to be. When life first came to exist on Earth, the planet did not have an atmosphere with much oxygen. There were plenty of reduced molecul...
These "unicorns of the sea" are actually whales with a long, spiraling tooth sticking out from their upper lip. Since most male narwhals have these tusks and most females do not, some scientists think that the tusk evolution is a case of sexual selection. Longer tusks usually also signal l...
Longer tusks usually also signal larger testes, another reason why scientists think the tusk is connected to a male's reproductive fitness. But the tusk is also highly sensitive, and may be a sensory tool for detecting changing conditions in the ocean; a 2017 video even shows, for ...
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But boy howdy, do you exist now. See, you’re not famous, but you’re infamous. You probably thought all publicity was good publicity. That is not the case if the publicity you’re getting is just making people become more and more furious and fed up with you. I haven’t seen ...
another reason why scientists think the tusk is connected to a male's reproductive fitness. But the tusk is also highly sensitive, and may be a sensory tool for detecting changing conditions in the ocean; a 2017 video even shows, for the first time, that some narwhals use it for fishing...
2023年上海中考一模英语试题分类汇编 专题6 完形填空含详解.docx,06-2023年上海市初三英语一模真题专项训练之完形填空 Choose the best answer to complete the passage(选择最恰当的选项,完成短文)(12分) 2023虹口一模 Do you ever find yourself doing something wit
Finally, we should mention some intermediary cases of parasitic activity. Certain species are known to be capable of either building a nest of its own or invading a nest already established by another species. In case of invasion the worker caste continues to exist. Examples of this duality are...
aThere is a kind of attention is called the silent has a good always exist in my heart has a blessing it will take in my heart let me say a few words on this is why can tell me There is a kind of attention is called the silent has a good always exist in my heart has a bless...