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99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object, 450 metres (1,480 ft) by 170 metres (560 ft) in size, [3] that caused a brief period of concern in December 2004 when initial observations indicated a probability of 2.7% that it would hit Earth on Friday, April 13, 2029.
The opah is the only fish known to exhibit whole body endothermy where all the internal organs are kept at a higher temperature than the surrounding water. [3] This feature allows opahs to maintain an active lifestyle in the cold waters they inhabit. [ 5 ]
A menacing asteroid named Apophis is projected to have a close encounter with Earth in 2029, but scientists have long ruled it out as an impact risk.
The type species, D. terrelli, is the largest, best-known species of the genus. Size estimates for this species range from 4.1–10 m (13–33 ft) in length, though estimates greater than 4.5 m are poorly supported. [4] [2] Skulls of this species can be up to 60–70 cm (24–28 in) in length. [2]
Astronomer Paul Wiegert had found a scenario in which Apophis could be sent careening into Earth in 2029. But we’d have to be extremely unlucky. Asteroid Apophis has the tiniest chance of ...
Top row: unaffected fish; bottom row: fish preyed upon by the carnivorous alga Pfiesteria shumwayae. Predatory dinoflagellates are predatory heterotrophic or mixotrophic alveolates that derive some or most of their nutrients from digesting other organisms. About one half of dinoflagellates lack photosynthetic pigments and specialize in ...
The adults of some species, such as Kryptolebias marmoratus, can additionally survive out of the water for several weeks. [3] Most killifish are small, measuring from 2.5 to 5 centimetres (1 to 2 in), with the largest species growing to just under 15 centimetres (6 in).
Scientists saw a male orca kill a juvenile great white shark within minutes last year. The hunting behavior could be a sign of a wider shift in the marine ecosystem.