Bio Final Flashcards - Quizlet Study with Quizlet and memorize flashcards containing terms like Which statement is both correct and supports ecologists' view that amphibian species extinctions are increasing?, Which is a major reason scientists are alarmed by the rapid and massive loss of amphibians?, A conservation biologist is promoting the preservation of a wilderness site that includes a stand of old-growth forest She
Z437 - Chapter 1 Flashcards - Quizlet Match the term with its definition Terms: A - Phylogenetic tree B - Node C - Monophyletic group D - Polytomy E - Paraphyletic group F - Polyphyletic group G - Plesiomorphy H - Synapomorphy I - Homoplasy J - Evolutionary radiation Definitions: 1 - a shared derived character 2 - an ancestor and all of its descendants 3 - group of organisms containing a common ancestor and some, but not all, of
Amazonian amphibians: diversity, spatial distribution . . . Of the 947 amphibian species recorded for the Amazon, 841 species (88 7%) were assessed by the International Union for Conservation of Nature - IUCN , while 39 species (4 1%) were not assessed (NA) and 68 species (7 2%) were considered Data Deficient (DD) Of the total Amazonian amphibian species, 589 species (62%) were classified as Least
Even more amphibians are endangered than we thought - Phys. org At least a quarter of the world's approximately 8,000 known species of amphibian are recognized as threatened and at risk of extinction But due 1 5 to a lack of data on many amphibian species
USGS Fact Sheet 2012–3092: The State of Amphibians in the . . . The estimated rate of worldwide amphibian extinction since 1980 is thought to be 105 times higher than the background rate (McCallum, 2007) These declines threaten the extinction of 30 percent of the world’s approximately 7,000 amphibian species (Stuart and others, 2004)
Estimated Number of Animal and Plant Species - Fact Monster No one knows for sure how many species of animals exist on Earth In fact, some 10,000 species of animals are discovered each year, with over one and a half million species already described Projections for the total number of species on Earth range from 2 million to 50 million