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, spiralling 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 ...
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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 ...
The Sibuya Game Reserve in South Africa has found thatmale lions spend 80% of their lives asleep--that's 18 to 20 hours every day. Female lions don't sleep quite that much, but still manage between 15 and 18 hours of sleep a day. If they have a large enough meal, it isn't unu...
Another kind of bee is the drone(雄蜂).Drones are male bees,and their job is to fly with the queen bee and mate with her.After the queen mates,the worker bees drive the drones away.The drones then starve to death. The third kind of bee is the queen.Each hive n...
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...
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
Worker bees will attack anything—even people—to keep their hive safe. Another kind of bee is the drone(雄蜂). Drones are male bees and their job is to fly with the queen bee and mate with her. After the queen mates the worker bees drive the drones away. The drones then starve to...