0
Why do scientists think that the first organisms did not need oxygen to survive?
Wiki User
∙ 10y ago
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.
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
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
Why scientists hypothesize that chemical events preceded the origin of life on earth?
Because life requires chemical processes. They had to be present first...
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 modern organisms do scientists think the first cells resembled?
Bacteria were the first cells.
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.
How do Scientists know that the first organisms were simple Unicellular Organisms?
microfossils A+ ally barclay
What is inferred to be the main source of the free oxygen that first entered earth?
oxygen producing organisms
When oxygen- breathing organisms first thrived?
The Paleozoic era was the era when oxygen-breathing organisms first thrived.
What came first oxygen or life?
Life came first. The oxygen in Earth's atmosphere is a product of living organisms carrying out photosynthesis.
What is inferred to be the main source of the free oxygen that first entered earth's atmosphere?
oxygen producing organisms
