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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.
What else can I help you with?
How do you know that the first living thing did not require oxygen?
Scientists infer this by studying the evolution of life on Earth. The first living organisms likely evolved in an anaerobic (oxygen-free) environment, as oxygen levels were not initially present in significant amounts on Earth. These organisms would have been adapted to survive in environments without oxygen, and the need for oxygen likely evolved later as more complex organisms developed.
How does organisms reproduce?
first you get the oxygen and make it turn to gas, then they inhale it trough there ears this is how they survive
Why did scientist think the first organisms did not need oxygen to survive?
becacuse animals lived under the ocean
What leads scientists to think that first cells to evolve did not need oxygen to survive?
maybe they breathed in something different
What organisms appeared first in earths history?
The first organisms on Earth were likely simple single-celled prokaryotes, such as bacteria and archaea, that appeared around 3.5 billion years ago. These early organisms were anaerobic, meaning they did not require oxygen to survive. These primitive life forms eventually evolved into more complex organisms over millions of years.
What do scientists think was the of the oxygen in earths atmosphere?
It came from primitive organisms early in earth's history. They were the first organisms to use photosynthesis to make food, by using light to convert Carbon dioxide and water into glucose (food) and oxygen. Since oxygen is a waste product of photosynthesis, it was released into the air. As more and more of these organisms multiplied, large amounts of oxygen were released into the air, forming today's atmosphere.
What forms of life do not require oxygen?
The first multicellular life does not need oxygen. That is the only type of life that does not need any oxygen at all basically. It is because a lot of organisms do not need the respiratory system at all.
What modern organisms do scientists think the first cells resembled?
Bacteria were the first cells.
Which best explains why the first organisms on Earth were anaerobic?
They thought this because the atmosphere contained very little oxygen. Anaerobic means without oxygen and the early atmosphere of the Earth was very low in oxygen. Only those organism that could live without oxygen could survive. Those cells were cyanobacteria which are sometimes (incorrectly) called blue-green algae.
What do scientist think was the source of the oxygen in earths atmosphere?
It came from primitive organisms early in earth's history. They were the first organisms to use photosynthesis to make food, by using light to convert Carbon dioxide and water into glucose (food) and oxygen. Since oxygen is a waste product of photosynthesis, it was released into the air. As more and more of these organisms multiplied, large amounts of oxygen were released into the air, forming today's atmosphere.
How do Scientists know that the first organisms were simple Unicellular Organisms?
microfossils A+ ally barclay
What came first oxygen or life?
Life came first. The oxygen in Earth's atmosphere is a product of living organisms carrying out photosynthesis.
