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Carbon dioxide
Darrin Kozey
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What are some important metals that come from Precambrian age rocks?
The first era is the Precambrian Era. During this time, which makes up 85% of the earth's existence, life was not common, partly because there was a lack of an environment that creatures could survive in. Early life consisted of single celled organisms and, possibly, viruses. These early cells likely got their energy from chemicals produced in the earth - not from the sun's energy. Unlike todays life, which mostly uses oxygen to survive, early organisms found oxygen to be a poison. Possibly as early as 2.5 billion years ago, an organism arose which used the sun's energy in a process called photosynthesis. This organism, called cyanobacteria (also called blue-green algae) excreted oxygen in the process and this changed the living planet as oxygen levels rose and killed off many other ancient organisms. Evidence of this early life comes in the form of stromatolites, which are rocky mounds which the cyanobacteria created on the ocean floor. Stromatolites are still being created by cyanobacteria, in the oceans and in hypersaline lakes. There is evidence of other organisms grazing on stromatolites as early as 1 billion years ago, which means that these more complex organisms had already evolved.
What element upon which most modern organisms depend was missing from earth's early atmosphere?
oxygen
How did early photosynthesis organisms change Earth's atmosphere?
Photosynthetic bacteria produced oxygen, and as they continued to colonize the earth they produced more oxygen. Eventually all the oxygen sinks became saturated, and this resulted in the Great Oxygenation Event (GOE). Aerobic organisms would late evolve and utilize the free oxygen.
What are phytoplanktons?
Phytoplankton refers to a broad category of organisms. Many belong to the kingdom Protista, and some belong to the kingdom Monera. They are all microscopic organisms that are capable of undergoing photosynthesis. Phytoplankton, or phytoplankton-like organisms are believed to be responsible for the Earth's first mass extinction, as their waste product, oxygen was suddenly released into the early atmosphere, which acted as a poison to early organisms that was used to the abundant sulfur in the atmosphere.
What were the first organisms to release oxygen into the atmosphere?
Oxygen was a waste product of the first organisms. They fed on the chemicals in the early sea, and spewed out oxygen, so much oxygen that oxygen replaced the carbon dioxide as an insulation layer. Plant today produce oxygen by photosynthesis.
Early organisms in the Precambrian era converted what to oxygen?
Carbon Dioxcide
Which early Precambrian era converted to oxygen?
carbon dioxide
What gas was lacking from earths early atmosphere in the early precambrian?
oxygen
Fossils of organisms found in the early precambrian are all of?
unicellular prokaryoytes
How did Earth come to have an oxygen atmosph?
early organisms created oxygen from other gases in the atomsphere
What are some important metals that come from Precambrian age rocks?
The first era is the Precambrian Era. During this time, which makes up 85% of the earth's existence, life was not common, partly because there was a lack of an environment that creatures could survive in. Early life consisted of single celled organisms and, possibly, viruses. These early cells likely got their energy from chemicals produced in the earth - not from the sun's energy. Unlike todays life, which mostly uses oxygen to survive, early organisms found oxygen to be a poison. Possibly as early as 2.5 billion years ago, an organism arose which used the sun's energy in a process called photosynthesis. This organism, called cyanobacteria (also called blue-green algae) excreted oxygen in the process and this changed the living planet as oxygen levels rose and killed off many other ancient organisms. Evidence of this early life comes in the form of stromatolites, which are rocky mounds which the cyanobacteria created on the ocean floor. Stromatolites are still being created by cyanobacteria, in the oceans and in hypersaline lakes. There is evidence of other organisms grazing on stromatolites as early as 1 billion years ago, which means that these more complex organisms had already evolved.
Was there oxygen in the atmosphere of early earth?
No! Stromatolites converted the toxic atmosphere into a breathable one.
Why do scientists think that the first organisms did not need oxygen to survive?
Breathable oxygen, or O2, did not exist in large quantities in the atmosphere until after the evolution of photosynthetic organisms. Hence, early organisms had to have an anaerobic metabolism, or one that did not require oxygen. However, compounds containing oxygen, such as water, have always been necessary to organisms.
Where do we get the oxygen from that we breathe in?
The early Earth atmosphere was toxic until the Stromatolites converted it to the nitrogen/oxygen mixture we now have. It is maintained by the trees and algae.
What are facts about early Precambrian bacteria?
i dont knoe\ \\
What element upon which most modern organisms depend was missing from earth's early atmosphere?
oxygen
Scientists believe that earth's early atmosphere changes in composition as a result of?
the appearance of oxygen-producing organisms
