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untrammelled    
a. 未上枷锁的;自由的

未上枷锁的;自由的

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  • Chordata - an overview | ScienceDirect Topics
    Chordata Chordata is defined as the most recent common ancestor of tunicates and cephalochordates, and all of that ancestor's descendants Chordates share a common, generalized body plan and can be diagnosed by four features shared by members of all the major groups: a notochord, pharyngeal slits, a hollow dorsal nerve tube, and a postanal tail (an extension of the body posterior to the anus)
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    Read more The post 15 Invasive Species That Are Reshaping Ecosystems Around the World appeared first on discoverwildscience advertisement Discover WildScience
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    The Living Planet Report 2020 report drew on wildlife monitoring of more than 4,300 different vertebrate species - mammals, fish, birds and amphibians - from around the world It found that
  • Rainbow Trout - U. S. Fish and Wildlife Service
    Steelhead trout (Oncorhynchus mykiss) belong to the family Salmonidae which includes all salmon, trout, and chars Steelhead are similar to some Pacific salmon in their life cycle and ecological requirements They are born in fresh water streams, where they spend their first 1-3 years of life They then emigrate to the ocean where most of their growth occurs After spending between one to four
  • Evolutionary dynamics of genome size and content during the . . .
    Improved resolution of phylogenetic relationships and signatures of introgression across the genome To generate the species tree, we first compiled a total data set of 4,011,390 base pairs of
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    With the definition of widespread alien species as species occupying ≥ 20 regions, around half of these widespread alien species showed declining spread rates towards the end of their time series (i e , the rate for their last three steps was lower compared with the mean of the preceding three steps), indicating that the inter-regional
  • Find a Species | U. S. Fish Wildlife Service
    Find a Species To search for specific species, begin your search with scientific names or common names Working with others to conserve, protect and enhance fish, wildlife, plants and their habitats for the continuing benefit of the American people





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