The ethanol (Alcohol) still contains much energy. Lactic Acid fermentation happens in muscle cells. During exercise, our muscle cells first respire aerobically but as we start panting, the body needs more oxygen to be brought to the muscle cells yet there is a limit to our heartbeat and heart rate.
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Ardipithecus ramidus, nicknamed  Ardi, is a hominid species that lived 4.4 million years ago in  what is now Aramis, Ethiopia. That makes Ardi more than a million  years older than the celebrated Lucy, the partial ape-human  skeleton found in Africa in 1974.By Azadeh Ansari (MORE) Lailuma Angeli.