Darwin thought that new species developed slowly, as populations of animals change over time.Not individual animals, but groups of them, over hundreds of thousands of years.In every group of animals, there's always a little difference. Some grow bigger, some are faster, and some might have ...
Bony fish are those that have true bones rather than cartilage in their endoskeletons. Endoskeletons are those found inside the body, as opposed to the exoskeletons that cover the outside of the body. They are the most abundant type of fish on Earth....
Nowadays, there are many celebrities who are famous for their glamour and wealth rather than achievements and this sets a bad example for young people. To what extent do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience....
对食品安全问题不放心4个月，伴反复检查、苦恼2个月。具体表现为：不敢在外边的饭店吃饭，担心饭店的菜洗不干净，炒菜用的油是泔水。不敢吃牛肉干，害怕得疯牛病，不敢吃猪肉，猪饲料中激素太多。尤其是“福寿螺”事件后，不仅小龙虾之类，甚至海鲜类的食物也拒绝吃了。米饭也是尽能少吃，因为大米上的农药...
And more monkeys than you find anywhere else on earth. In Brazil alone nine new species of monkeys have been identified over the last year. But many of those species, known and unknown, are destroyed every day. Moreover, constant logging, mining and raising domestic animals cause a gradual ...
“Species aren’t equally distributed across the Earth; they have these hotspots,” Fisher said. For example, says AMNH entomologist Randall Schuh, as of 2003 there are about 2,000 known plant-eating bug species in North America, but only 200 in Australia, while the sampling of Australia’...
Biodiversity(生物多样性), or biological diversity, is a wide-ranging concept that covers all the different kinds of plant and animal species present on earth. Environmentalists believe that many millions of species exist. As all these living organisms are dependent on each ot...
Baby elephants are nursed on milk produced by their mothers, just like all other mammals. © Globalpix/Getty How many species of elephant are there? There are three elephant species: the African bush elephant, also known as the African savannah elephant (Loxodonta africana), the African forest...
The boreal forest exists in the northern part of the world, south of the tundra. In some parts of the boreal forest, there is snow on the ground for up to 10 months of the year, making life here difficult for plants and animals. For this reason, the variety of animals found ...
How many species of insects are there? More than half of all the animal species described by science are insects, and it is estimated that there are more than five million extant species. That’s a lot ofbeetles,butterflies, moths,ants,bees, wasps, flies,termites,crickets,grasshoppers, cockro...