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Dinosaur extinction: Was an asteroid the only cause of …
Its dinosaurs worth dedicating extinct up to asteroid 80 asteroid of your time to writing this section.
The size issue is dominant in evolutionary inquiries, and scientists have found that in Greenhouse Earth conditions, animal size is relatively evenly distributed, and all niches are taken. When Icehouse Earth conditions prevail, the cooling and drying encourages some animal sizes and not others, and mid-sized animals suffer, such as those early primates. That may be why primates went extinct outside the tropics in the late Eocene. Tropical canopies are rich in leaves, nectar, flowers, fruit, seeds, and insects, while temperate canopies are not, particularly in winter. Large herbivores lost a great deal of diversity in late-Eocene cooling, but the survivors were gigantic, and the thundered across Eurasia in the Oligocene. Mid-sized species were rare in that guild.
Dinosaurs Extinction - The Asteroid Theory.
After as little as a half-million years of bedraggled survivors adapting to ice age seas, the ice sheets retreated and the oceans rose. The of the time may have also changed, and upwelling, anoxia, and other dramatic chemistry and nutrient changes happened. Those dynamics are suspected to be responsible for the second wave of extinctions. There also seem to have been .Atmospheric oxygen levels may have fallen from around 20% to 15% during the Ordovician, which would have contributed to the mass death. Seafloor anoxia seems to have been particularly lethal to continental-shelf biomes, possibly all the way to shore. It took the ecosystems millions of years to recover from the Ordovician-Silurian mass extinction, but basic ecosystem functioning was not significantly altered in the aftermath, which is why a has been proposed as a more significant extinction event. The were laid down by the . Most oil deposits were formed in the era of dinosaurs and the processes of oil deposit formation were similar; they were related to oceanic currents. When currents came to shore via the bottom and the prevailing winds blew the top waters offshore, it became a and anoxic sediments could form. When the winds blew onshore and left via the bottom, the waters became clear and are known as nutrient deserts. The oscillation between nutrient traps and nutrient deserts can be seen in oil deposit sediments. In the mid-20th century, Soviet scientists revived an old hypothesis that oil was , a variation of which was also championed by , but improving tools and investigation invalidated those hypotheses. No petroleum geologists today seriously consider the abiogenic origin of hydrocarbons. Oil sediment formation events seem related to mantle and crust processes that created high sea levels and anoxic events, and the last great one was in the , which formed more than 10% of the world's oil deposits.
The rise of life was based on . Just as the remained basically unchanged since the Cambrian Explosion, energy systems form the foundations for all ecosystems and civilizations. While the superstructure change and can seem radical at times, the foundation dictates what kind of superstructure exist. A huge superstructure built on a small foundation, if it can be built at all, will not be very resilient (the first earthquake or storm levels it), and will not last long. Today, industrialized civilization is burning through its foundational energy sources a million times as fast as they were created and will largely . On the , the rise and fall of humanity may happen in the blink of an eye and create more ecosystem devastation than the asteroid that wiped out the dinosaurs; it would happen faster than all previous mass extinctions other than that asteroid’s effect. Arthropods may then come to rule the world once again.
not an asteroid, that caused the dinosaurs' extinction
Mass extinction events may be the result of multiple ecosystem stresses that reach the level where the ecosystem unravels. Other than the meteor impact that destroyed the dinosaurs, the rest of the mass extinctions seem to have multiple contributing causes, and each one ultimately had an energy impact on life processes. The processes can be complex and scientists are only beginning to understand them. This essay will survey mass extinction events and their aftermaths in some detail, as they were critical junctures in the journey of life on Earth.
The twin ideas of efficiency and resilience are important. Efficiency is about getting more for less, particularly energy. Although aerobic respiration’s energy efficiency allowed for to develop, they end up creating interactions and dependencies, and the entire structure can lose its resilience when compared to simpler systems. Remove one part of the food chain and the entire ecosystem can collapse, and it can be part of the chain, from top to bottom. Making systems more efficient, as the last bits of energy are wrung from the system, reduces their resilience to the real world’s surprises. That dynamic is probably a key contributing factor of mass extinctions during the eon of complex life. Modern ecosystems studies are making the connections clear and are being applied to the dynamics of human civilizations; work has been seminal in this regard. Complex ecosystems pass through of exploitation, conservation, release, and reorganization, and three dimensions of interaction are involved: potential, connectedness, and resilience. In general, simple systems are more stable than complex ones, which is another reason why any , if there were any, would have been far less cataclysmic than those of complex life.
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Why did dinosaurs become extinct? - Easy Science For …
The view of dinosaurian intelligence has also changed radically in the past generation, as evidence has been discovered that some dinosaurs were significantly (particularly the ), as well as evidence for , and . Dinosaurs had the first hands, even with . Recent work on encephalization suggests that animals were well on their way toward human-level encephalization hundreds of millions of years ago, and were prevented from attaining it far earlier, , due to the Permian extinction. The world might be populated with sentient, civilized, and even space-faring reptiles today if events had played out slightly differently, such as that asteroid missing Earth 66 mya (or technologically advanced dinosaurs preventing its impact).
Why did dinosaurs become extinct? - Easy Science For Kids
From the Permian extinction’s devastation arose a reptilian sheep called . Fossil hunters of early Triassic sediments have been frustrated for many years, as nearly are , because it was about the Permian extinction’s only land animal survivor. There has been about why it survived when almost nothing else did. No single animal ever dominated Earth’s land masses as thoroughly as did during the early Triassic. was probably a burrower (many have likened to a pig because of that burrowing), which may have provided the shelter needed to survive the Permian holocaust. It may also have been a and could eat most surviving plants. But some think that its survival, when almost every other species died, was due to luck. Luck is a surprisingly common proposed explanation for evolutionary events and outcomes, and some creatures seemed to be in the right place at the right time while others were in the wrong place at the wrong time. The spread of was also aided by two other facts: the land masses , so could simply walk to dominance of Earth; and few predators capable of eating a survived. One (being semi-aquatic may have also helped species survive the Permian extinction), as did , but not much else did. was a , as were the dominant land animals before the Permian extinction.
The asteroid hypothesis as the cause of the K T extinction was not ..
The direct ancestors of dinosaurs, , first appeared in the late Permian, and some survived into the Triassic as . Until recently, the first true dinosaur was widely considered to be , which appeared about 231 mya. Eoraptor looks like a miniature and in fact is in the terrestrial dinosaur line that culminated with the Lizard King, called . A , however, made the case that , dated to 243 mya, is either the first dinosaur yet discovered or a close cousin to it. Birds are also , as the only survivor of that line and the only surviving dinosaurs. Eoraptor was about a meter long and weighed ten kilograms. The time from the to the first dinosaurs spanned nearly 100 million years, but there was nothing spectacular about them then, as their early years were dominated by , then , and then . Why dinosaurs rose to prominence has been a source of controversy and debate, but the contending answers are energy-based.
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