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Which event is inferred to have contributed to the significant global climate change that may have caused the mass extinctions of organisms at the end of the Late Cretaceous Epoch?
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The deadliest of all mass extinctions which killed 95 percent of all living organisms was the?
Permian-Triassic extinction, 251 MYA (million years ago) in the Paleozoic era.
Why did seed ferns become extinct in the late cretaceous?
Many organisms became extinct in the late cretaceous and even before the K-T extinction event. Possibly one reason is that seed ferns had been losing the battle to the rising tide of agiosperms ( flowering plants ).
Which event contributed most directly to the evidence of aerobic organism?
The development of photosynthesis in primitive organisms, specifically cyanobacteria, contributed most directly to the evidence of aerobic organisms. Photosynthesis evolved around 3 billion years ago, producing oxygen as a byproduct. This oxygen accumulation in the atmosphere eventually allowed for the development of aerobic organisms, which rely on oxygen for their metabolism.
How is carbon significant to a living organism?
All living organisms contain carbon.
Of the four classes of biologically significant macromolecules the one that provide the main source of energy for most organisms are?
Carbohydrates.
How many extinctions has earth experienced in its history?
Mass extinctions--at least two--one at the end of the Permian, and one at the end of the Cretaceous, with numerous other less severe events. As far as the extinction of individual species, that list would cover millions of extinct organisms.
The end-cretaceous extinctions were followed by the . a. adaptive radiation of mammals and birds b. appearance of hard-shelled marine organisms c. appearance of first land plants d. insects?
The answer is a.
Where did most of the organisms live in the cretaceous period?
Unsure by many of the organisms were wiped out but probably Asia
What were the dominant organisms during the Cretaceous period?
My cousin lenny
Did organisms live before Cretaceous Tertiary?
Yes, many.
What were the dominant organisms living at the time of cretaceous period?
dinosaurs
What were dominant organisms living in the Cretaceous?
dinosaurs among animals on land and gymnosperms among plants
Dominant organisms in tertiary time period?
The dominant organisms living at the Cretaceous period or time were first primates and flowering plants. This was the time when the extinction of the dinosaurs took place.
What were the dominant organisms living in Cretaceous time?
dinosaurs among animals on land and gymnosperms among plants
What is the group with the most extinctions?
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.
How does the Cretaceous-Tertiary extinction relate to the age of Mammals?
The extinction of so many organisms left a large ecological niche to expand into, which mammals did.
What do most scientist think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous Period?
A meteor hit the earth and caused severe condition that organisms could not survive.
