Search results
Results From The WOW.Com Content Network
Dingerkus (1986) suggested that the whale shark is the closest relative of the zebra shark, and proposed a single family encompassing all five species in the clade. [8] Compagno (1988) suggested affinity between this species and either Pseudoginglymostoma or a clade containing Rhincodon , Ginglymostoma , and Nebrius . [ 3 ]
Dresbachian extinction event: 502 Ma: End-Botomian extinction event: 517 Ma: Precambrian: End-Ediacaran extinction: 542 Ma: Anoxic event [45] Great Oxygenation Event: 2400 Ma: Rising oxygen levels in the atmosphere due to the development of photosynthesis as well as possible Snowball Earth event. (see: Huronian glaciation.)
Environmental Date Date(s) National Bird Day: January 5 International Zebra Day: January 31 World Wetlands Day: February 2 World Ostrich Day [3] [4] February 2 World Marmot Day [5] [6] February 2 World Pangolin Day [7] [8] Third Saturday of February World Whale Day [9] Third Sunday of February World Bonobo Day [10] [11] [12] February 14 World ...
Older than dinosaurs and trees, sharks have endured a lot throughout their 450 million years on Earth. They’ve even survived five mass extinctions, including the asteroid that wiped out 75% of ...
The resulting loss of marine species made way for the golden age of sharks during ... A growing number of scientists believe a sixth mass extinction event of a magnitude equal to the prior five ...
Sharks could be facing extinction over the next couple of decades. Human interference is largely to blame for the species interference. Overfishing of sharks has increased as the global demand has ...
Extinction of taxa is difficult to detect, as a long gap without a sighting is not definitive. Some mammals declared as extinct may very well reappear. [1] For example, a study found that 36% of purported mammalian extinction had been resolved, while the rest either had validity issues (insufficient evidence) or had been rediscovered. [3]
The 2007 film Sharkwater documents ways in which sharks are being hunted to extinction. [15] In 2009, the IUCN Shark Specialist Group reported on the conservation status of pelagic (open water) sharks and rays. They found that over half the pelagic sharks targeted by high-seas fisheries were threatened with extinction. [16] [17] [18]