Answer:
The first human ancestors appeared between five million and seven million years ago, probably when some apelike creatures in Africa began to walk habitually on two legs. They were flaking crude stone tools by 2.5 million years ago. Then some of them spread from Africa into Asia and Europe after two million years ago.
Under anaerobic conditions in yeast cells, pyruvate is converted to acetaldehyde and carbon dioxide, with the acetaldehyde being subsequently converted to ethanol in a step that oxidizes NADH to NAD. This process is called alcoholic fermentation.
Alcoholic fermentation is a process which involves the conversion of sugars into ethyl alcohol and carbon dioxide by yeast. This process can occur under aerobic as well as anaerobic conditions.
Under anaerobic conditions, the yeast cells convert the pyruvate into ethanol. The pyruvate is first converted into acetaldehyde and carbon dioxide is released. Acetaldehyde is then converted to ethanol. NADH is oxidized to form NAD+.
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asteroids orbit a larger planet in two special places, known as Lagrange points, where the gravitational pull of the sun and the planet are balanced. Jupiter Trojans are the most numerous, boasting nearly as high a population as the main asteroid belt. Neptune, Mars and Earth also have Trojan asteroids
<span>In general, a species' realized niche will be smaller than its fundamental niche due to interactions with other organisms in the community.
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