Clostridium, Bacteroides, and the methane-producing archaea (methanogens), are called obligate anaerobes because their energy-generating metabolic processes are not coupled with the consumption of oxygen.
        
             
        
        
        
Answer:
Your skin regulates your body temperature through blood vessels and through the process of sweating. The skin is in effect your body's thermostat. When you're out in cold weather, your skin triggers shivering so the blood vessels will contract and keep you as warm as possible.
Explanation:
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Photosynthesis creates glucose and oxygen. used for humans to inhale and then exhale carbon dioxide to go back into plants and redo this cycle.
        
             
        
        
        
Answer:
Vor 416 bis 360 Millionen Jahren
Wurzeln waren eine frühe Entwicklung im Pflanzenleben und entwickelten sich an Land während der Devon-Zeit vor 416 bis 360 Millionen Jahren (Gensel et al., 2001; Raven und Edwards, 2001; Boyce, 2005; Kenrick, 2013).
Explanation:
Entschuldigung, wenn das nicht geholfen hat