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- Transitional fossil - Wikipedia
Indeed, Archaeopteryx was discovered just two years later, in 1861, and represents a classic transitional form between earlier, non-avian dinosaurs and birds Many more transitional fossils have been discovered since then, and there is now abundant evidence of how all classes of vertebrates are related, including many transitional fossils [5]
- Homo erectus | The Smithsonian Institutions Human Origins . . .
Early fossil discoveries from Java (beginning in the 1890s) and China (‘Peking Man’, beginning in the 1920s) comprise the classic examples of this species Generally considered to have been the first species to have expanded beyond Africa, Homo erectus is considered a highly variable species, spread over two continents (it's not certain
- 1 million species are under threat. Here are 5 ways we speed . . .
Stories about individual species on the brink of extinction may be all too familiar But a new tally now reveals the breadth of the conservation crisis: One million of the world’s species are
- Biology Final Flashcards - Quizlet
When a small number of species diversifies into a much larger number of species In a brief period of time, a small number of species diversified into a much larger number of species, able to live in a wide diversity of habitats Called an adaptive radiation, such a large and rapid diversification has occurred many times throughout history
- Discovery of fossilized footprints reveals the moment two . . .
Pictured above is a fossil footprint believed to have been created by a hominin species known as Paranthropus boisei, one of 12 such footprints unearthed in Kenya that date back 1 5 million years
- Human impacts on the rates of recent, present, and future . . .
The ≈10,000 species of birds are better known than any other comparably sized group of species Estimates of their extinction rates influence estimates for other taxa and provide the foundation for concerns about human impacts on the global rates of biodiversity loss ()
- Jellyfish and Comb Jellies | Smithsonian Ocean
OVERFISHING Over the past two decades, between 100 and 120 million tons of marine life have been removed from the ocean by fisheries each year on average A lot of these marine species, including fish and invertebrates such as squid, eat some of the same food that jellies do: mainly, zooplankton
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