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Did organisms that require oxygen exist before photosynthetic organisms?
It would be impossible for oxygen requiring organisms to exist before photosynthetic organisms because there was not oxygen in the atmosphere for these organisms to breathe. Photosynthetic organisms take carbon dioxide and water in and create oxygen as waste. Before these photosynthetic organisms existed there was not enough or any oxygen in the atmosphere for organisms requiring oxygen to survive.
Organisms that use oxygen?
Aerobic organisms use oxygen.
What are organisms that release oxygen?
Organisms that release oxygen as a byproduct of photosynthesis include plants, algae, and cyanobacteria. These organisms use sunlight to convert carbon dioxide and water into oxygen and glucose, releasing oxygen into the atmosphere as a result.
How do organisms at deep sea vents survive without oxygen?
These organisms do not need oxygen. They are called anaerobes.
What do organisms do with the oxygen they absorb from the air?
Organisms use the oxygen they absorb from the air for their cells. The cells need this oxygen in order to carry out their functions.
Organisms get their oxygen from?
respiration
How do organisms get their oxygen from?
respiration.
What are 2 ways organisms obtain oxygen?
Organisms obtain oxygen through respiration, where they take in oxygen from their environment and release carbon dioxide as a waste product. Aquatic organisms such as fish can also extract oxygen from the water through their gills.
How does oxygen effect the of organisms?
Oxygen is essential for cellular respiration in organisms, where it is used to produce energy. Without oxygen, most living organisms would not be able to survive. However, prolonged exposure to high levels of oxygen can also be toxic to certain organisms, causing damage to cells and tissues.
Which group of organisms is the source or oxygen in the oxygen cycle?
Plants.
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.
What is the name of an organism that requires oxygen?
Organisms which need oxygen are called aerobic organisms or aerobes. The oxygen is used in the process of respiration to release energy from food. Organisms which do not use oxygen in respiration are called anaerobic organisms or anaerobes. See: http://en.wikipedia.org/wiki/Aerobic_organism
