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安裝中文字典英文字典辭典工具!
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- Species - Stanford Encyclopedia of Philosophy
The nature of species is controversial in biology and philosophy Biologists disagree on the definition of the term ‘species,’ and philosophers disagree over the ontological status of species Yet a proper understanding of species is important for a variety of reasons Species are the fundamental taxonomic units of biological classification
- Science chapter 10 Flashcards - Quizlet
Why are there so many species still unknown to modern science Cataloging these species is a huge task Where are many critical biodiversity hotspots located
- How long do most species last before going extinct?
For mammals, the average species exists for 1 million to 2 million years, Some experts estimate that the current extinction rate is only 100 times faster or, at the other extreme, 10,000 times
- CK12-Foundation
Important mammals include Dolly the sheep, Lassie the dog, and flipper the dolphin Dolly was the first mammal to be cloned from an adult somatic (body) cell , using the process of nuclear transfer Lassie was a collie dog who appeared in seven full length feature films in the 1940s and 1950s, starting with Lassie Come Home in 1943
- Mammal - Definition and Examples - Biology Online Dictionary
Mammals are endothermic vertebrates belonging to class Mammalia of phylum Chordata Some of their distinctive features are as follows: a neocortex, three middle ear bone s, a lower jaw made of a single bone , a hairy body covering, a thoracic diaphragm, a four-chambered heart, and females that are mostly viviparous
- Elephant - Wikipedia
Three living species are currently recognised: the African bush elephant (Loxodonta africana), the African forest elephant (L cyclotis), and the Asian elephant (Elephas maximus) They are the only surviving members of the family Elephantidae and the order Proboscidea; extinct relatives include mammoths and mastodons
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