Bacteria that require oxygen to grow are called obligate aerobic bacteria. In most cases, these bacteria require oxygen to grow because their methods of energy production and respiration depend on the transfer of electrons to oxygen, which is the final electron acceptor in the electron transport reaction. When you sleep, your mouth produces less saliva so you don't keep swallowing all night. Unfortunately, less saliva helps bacteria and germs thrive. If you have bad breath in the morning, it's probably because a lack of saliva made it possible for bacteria and germs to grow their numbers overnight. Because there are only finite amounts of nutrients available on the earth, they must be recycled in order to ensure the continued existence of living organisms. Matter cycling is where matter moves from one form to another or from one place to another on the earth, and inside its ecosystems. Matter is constantly cycling from place to place, and this can have positive or negative effects. Matter also cycles naturally, and due to human activity. As energy moves through an ecosystem, it changes form, but no new energy is created. Similarly, as matter cycles within an ecosystem, atoms are rearranged into various molecules, but no new matter is created. So, during all ecosystem processes, energy and matter are conserved.
The cycling of matter because there are only finite amounts of nutrients available on the earth, they must be recycled in order to ensure the continued existence of living organisms. Sometimes called nutrient cycles, material cycles describe the flow of matter from the nonliving to the living world and back again. As this happens, matter can be stored, transformed into different molecules, transferred from organism to organism, and returned to its initial configuration. Plants need carbon dioxide to make their own food and they release oxygen in the process. Oxygen is also found in the air. Organisms like plants and green algae make their own food. During this process, the organisms release oxygen into the air. The carbon cycle moves atmospheric carbon into plants, and thus animals when they consume plants. Animals exhale carbon dioxide, increasing atmospheric levels. Water provides the ingredients needed for plants to do photosynthesis and remove carbon dioxide. Matter is cycled through ecosystems via biogeochemical cycles. Water can occur in all states as it moves through the water cycle. Carbon moves between the abiotic and biotic components of the ecosystem via photosynthesis and cellular respiration. Because geology and chemistry have major roles in the study of this process, the recycling of inorganic matter between living organisms and their environment is a biogeochemical cycle. The cycling of these elements is interconnected. Balance is essential to the earth. Chemical cycles keep the amount of elements on the earth in a perfect balance. The amount of oxygen in and around the earth is fixed. But this oxygen is fed again and again through the world's living systems in a never-ending circle called the oxygen cycle
Whereas essentially all eukaryotic organisms require oxygen to thrive, many species of bacteria can grow under anaerobic conditions. Bacteria that require oxygen to grow are called obligate aerobic bacteria. When you sleep, your mouth produces less saliva so you don't keep swallowing all night. Unfortunately, less saliva helps bacteria and germs thrive. If you have bad breath in the morning, it's probably because a lack of saliva made it possible for bacteria and germs to grow their numbers overnight. Anaerobic bacteria are germs that can survive and grow where there is no oxygen. For example, it can thrive in human tissue that is injured and does not have oxygen-rich blood flowing to it. Infections like tetanus and gangrene are caused by anaerobic bacteria. The immune system's battle against invading bacteria reaches its peak activity at night and is lowest during the day. Bacteria and many microorganisms are very sensitive to oxygen concentrations. Some will only grow in its presence and are called obligate aerobes. Facultative aerobes will grow either aerobically or in the absence of oxygen (anaerobic conditions), but they generally do better with oxygen. Deep below Earth's surface, life finds a way. Traces of cyanobacteria have been found more than 600 meters underground in a rocky outcrop in Spain, suggesting the microbes can survive without sunlight. Bacteria grow most rapidly in the range of temperatures between 40 °F and 140 °F, doubling in number in as little as 20 minutes. This range of temperatures is often called the "Danger Zone." Never leave food out of refrigeration over 2 hours.Strict aerobic bacteria can only grow in the presence of oxygen, used to re-oxide coenzymes reduced during the energy metabolism. For this group, the oxygen can be considered as an essential substrate and a lack of oxygen leads to growth inhibition. Because there are only finite amounts of nutrients available on the earth, they must be recycled in order to ensure the continued existence of living organisms.