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- Amphibians | manoa. hawaii. edu ExploringOurFluidEarth
Within the subphylum Vertebrata there are seven classes of organisms and approximately 52,000 species (Fig 5 3) However, prior to 360 million years ago, the only vertebrates that existed were the fishes, including the jawless fish (Class Agnatha), the sharks and rays (Class Chondrichthyes), and the bony fishes (Class Osteichthyes)
- 41. 6: Overview of Vertebrate Organ Systems - Biology LibreTexts
More than 62,000 vertebrate species have been identified The vertebrate species now living represent only a small portion of the vertebrates that have existed The best-known extinct vertebrates are the dinosaurs, a unique group of reptiles, which reached sizes not seen before or after in terrestrial animals
- Using the IUCN Red List to map threats to terrestrial . . .
There are sizeable continental areas in which there was a greater than 50% chance that any given amphibian, mammal or bird species was threatened by logging, hunting and trapping, agriculture, invasive species or climate change (between 1 6 and 10 8 million km 2; Extended Data Fig 3) Fig 1 Probability of impact for amphibians
- Greenland shark - Wikipedia
The Greenland shark has the longest known lifespan of all vertebrate species [50] It is estimated that the species has a lifespan of at least 272 years, with the oldest individual estimated to be 392 ± 120 years of age Estimates of age were made using radiocarbon dating of crystals within the lenses of their eyes [10]
- The evolutionary origins of the vertebrate olfactory system
There is, however, an important difference in the olfactory system Jawed vertebrates have paired nostrils leading to paired olfactory sacs and derived from the paired olfactory placodes Lampreys and hagfish have a single median nostril, a condition known as monorhiny
- Living Planet Index
This dataset contains time-series of population abundance data for vertebrate species spanning years between 1970 and 2020 This is the public version of the database as confidential records that cannot be shared have been removed
- 7. 6: Components of Vertebrate Blood - Biology LibreTexts
There are approximately 25 trillion red blood cells in the five liters of blood in the human body, which could carry up to 25 sextillion (25 × 10 21) molecules of oxygen in the body at any time In mammals, the lack of organelles in erythrocytes leaves more room for the hemoglobin molecules, and the lack of mitochondria also prevents use of
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