bottom of the pyramid i think usually, I'm not too sure myself a teacher gave me this answer for the same question.
In closed-in environments with limited resources. If they are exposed to oxygen, they are severely damaged or destroyed.
Bacteria produce toxins as a byproduct. They are formed when the bacteria produce energy for themselves by changing one substance into another, and in some cases, there are byproducts, some of which can be toxins.
Chemosynthetic bacteria means bacteria that can make chemical things (synthetic). Basically any bacteria are chemosynthetic - they all product different chemicals as part of their metabolism. There are methanogens that produce methane gas, there are photosynthetic organisms that produce oxygen (like plants, and the ancestry of plants), others can produce nitrogen gas, like those bacteria that live in nodules on legume plants. Other bacteria can produce acids from fermentation like proprionic acid which gives Swiss cheese its nutty flavor. So lots and lots of bacteria are chemosynthetic. It just depends on what you want to produce.
By feeding on other organisms. Some bacterias are also photosynthetic and are able to produce energy using sunlight. Others are also chemotrophic and are able to produce energy using inorganic chemicals.
Methane is correct
some bacteria produce toxins in their metabolism which is harmful for humans. if you have used antibiotics, the normal, good, bacteria that live in your body can be replaced by a pathogen, which will make you sick.
Chemoautotrophic
Chemosynthetic bacteria does not require sunlight to live and derives the nutrients from nonfood sources. Examples of chemosynthetic bacteria are lactobacillus and streptococcus.
Bacteria produce toxins as a byproduct. They are formed when the bacteria produce energy for themselves by changing one substance into another, and in some cases, there are byproducts, some of which can be toxins.
photosynthesis
NO bacteria are methanogenic, archaea are methanogenic. And they produce it through a process called chemolithoautotrophy, where they break down the inorganic molecules into energy.
Chemoautotrophic
photosynthesis
photosynthesis.
Chemosynthetic bacteria means bacteria that can make chemical things (synthetic). Basically any bacteria are chemosynthetic - they all product different chemicals as part of their metabolism. There are methanogens that produce methane gas, there are photosynthetic organisms that produce oxygen (like plants, and the ancestry of plants), others can produce nitrogen gas, like those bacteria that live in nodules on legume plants. Other bacteria can produce acids from fermentation like proprionic acid which gives Swiss cheese its nutty flavor. So lots and lots of bacteria are chemosynthetic. It just depends on what you want to produce.
Genetically modified bacteria can be used to produce. This is a transgenic bacteria.
Photosynthesis is the answer
Strictly fermentative bacteria produce ATP, but only through glycolysis.