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Living Fossils

... specific laws of speciation, at least among eukaryotes a certain species has existed, on average, several hundreds of thousands or millions of years, and then gives rise to a new one or goes extinct. In some groups of animals, especially protozoans or molluscs (for example, bivalves and gastropods, as well as ammonites), some mammals (for example, rodents), the rate of speciation is even higher. It is owing to the change of living forms that we notice how dynamically the image of the Earth’s organic ...

Modified: 30.05.2006
ancient organisms , Pygmalion , mosses , horse-tails , ginkgo biloba , nautilus , horseshoe crabs , molluscs , extinction
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