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This is an interesting question and not one that is easily answered. In terms of the entire history of life on earth the groups of individual species that have been around the longest would have experienced the most extinctions. The more complex the animal the fewer organisms produced and therefore the fewer species available for
extinction. This makes various unicelluar organisms (animal, plant and bacterial) subject to the most extinctions.
Even though several mass extinctions have occurred, the focus is primarily on the larger identifiable organisms of the time, (Dinosaurs for example), especially those that have a fossil record proving they existed.
This places the focus on complex plants and animals. Focus is often on man caused extinctions as well...which are, on the whole, a very small number in the
grand scheme of the history of life on Earth.
The primary concept to remember is that: Extinction is the rule, NOT the exception.
What else can I help you with?
What is the animal group with the most extinctions?
invertabates are the animals with the most extinctions
Why do you think most extinction's occur as background extinctions?
Most extinctions occur as background extinctions because they are longer time periods unlike the shorter mass extinctions which there were only two in the Paleozoic era, the Ordovician mass extinction, and the Permian/Triassic extinction in which 95% of all marine animals became extinct
Where are most extinctions occurring today?
Tropical rain forest
What has changed most of the mass extinctions on earth?
climate change
Why do we think most extinctions occur as background extinctions?
Most extinctions are believed to occur as background extinctions because they result from gradual changes in environmental conditions, competition, and ecological shifts rather than catastrophic events. These slow processes allow species to gradually decline over time due to factors like habitat loss, climate change, and resource depletion. Background extinctions typically reflect the normal turnover of species, where weaker or less adaptable organisms are outcompeted or unable to survive in changing conditions. This contrasts with mass extinctions, which are sudden and dramatic, affecting a wide range of species simultaneously.
Past mass extinctions most likely occurred as a result what?
Sudden changes in environmental conditions.
What was the outcomes of each of the mass extinctions?
The outcomes of each of the mass extinctions is that animal and/or bacteria die.
Do scientists believe that extinctions are uncommon?
No, they are fundamental to the process of evolution. Mass extinctions are less common.
Do extinctions happen frequently?
No
How do mass extinctions appear to be related to the appearance of new major groups of organisms?
I was thinking the same thing. i think that its because when one group goes extinct the new major group thrives because somehow the now extinct group died off.
Have extinctions occurred in the past?
Yes, extinctions have happened throughout history, they are happening today and will continue to happen in the future.
What can change the food chain?
Extinctions.
