Answer:
the gathering of minerals as a recreation aka mining
Answer:
2.7 billion
Explanation:
This period is referred to as the Great Oxygenation Event. This period saw the evolution of photosynthetic organisms (cyanobacteria) that utilized carbon dioxide (that dominated the atmosphere then) and sunlight to manufacture their energy molecules-glucose. Photosynthesis produces oxygen as a byproduct that is evolved into the atmosphere. As these photosynthetic organisms proliferated on earth, the atmosphere composition changed to become partly dominated by oxygen (which is an oxidaton agent) with less and less carbon dioxide.
Bioethanol is an alcohol made by fermentation. Also <span>Biofuel is made from Fermentation.
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A control is used to establish a baseline in an experiment.
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Secondary consumers include the baleen whale and the much smaller herring. The baleen whale is a large mammal with few predators that filter materials from the ocean through their mouths, this material includes algae and plankton. Herring is a smaller fish that also consumes algae to provide food for survival.
