According to Reference .com, "<span>Unicellular microorganisms, called </span>obligate anaerobes<span>, strictly use anaerobic respiration for energy production. Common examples of </span>obligate anaerobes<span> are some species of bacteria, such as </span>Clostridium tetani<span>, </span>Clostridium<span> botulinum,</span>Clostridium perfringens<span>, </span>Clostridium sporogenes<span> and </span>Clostridium difficile<span>."</span>
Without oxygen, organisms can just split glucose into two molecules of pyruvate. ... With oxygen, organisms can break down glucose all the way to carbon dioxide. This releases enough energy<span> to </span>produce<span> up to 38 ATP molecules. Thus, aerobic</span>respiration<span> releases much more </span>energy<span> than </span>anaerobic respiration<span>. thats what Respiration to generate engery is </span>
A localised group of organisms that belong to the same species is called Population. This can be a local population if the organisms stay at a particular place or a metapopulation if the organisms tend to move from one geographical location to another.
