Bacteria are not present in and out side of baby by birth. Baby is born sterile. Baby receive heavy dose of immunoglobulin in colostrum. Then after birth bacteria rapidly get hold of the colon. Though, there is acid barrier in stomach. They are not present in small intestine also. Science used the word commensals (harmless.) bacteria for them. They help in decomposition of food material, give Vitamin K and other few Vitamins. One third bulk of the feces is formed by bacteria. There importance is noticed, when you give broad spectrum antibiotics like Tetracycline's, Chloramphenicol, Third generation cephalosporins (Like cefpotaxime or cefixime, or ceftriaxone, cefoxime, ceftazidime etc.) Next day or after two days, he comes with severe loose motion. You have killed the 'normal' flora of the intestine and you have 'Pseudomembranous enterocolitis' is there to handle the with.( Caused by clostodium difficile or candia albicans.) Untreated patient will die of dehydration. So they have unparalleled advantage of preventing the growth of 'abnormal' bacteria. You have to stop the antibiotic and give 'imidazole derivatives like metronidazole, tinidazole, satronidazole, ornidazole or secnidazole. (Last two are almost useless.) If it does not work ( For last thirty years, it always worked.) you have to give vancomycin.
Bacteria are essential to almost all life that is not a primary producer at the base of the food chain. For example, bacteria are essential to complete digestion in the gut of many animals, including humans. Bacteria break down dead organic matter in the ecosystem. So-called "good" bacteria act as beneficial symbionts to almost all animals by filling a variety of roles, including protection against harmful bacteria.
extracellular digestion
Bacteria in the gut play a major role in digestion. In some cases, the bacteria consume the food and transform it into a form the body can digest. This happens with the digestion of celery.
digestion
Bacteria can affix atmosphereic nitrogen, which is an essential step in the nitrogen cycle.
yes some bacteria help aid digestion
Bacteria aide in digestion, not viruses.
the digestion of food is necessary for us to get energy
Bacteria are essential to almost all life that is not a primary producer at the base of the food chain. For example, bacteria are essential to complete digestion in the gut of many animals, including humans. Bacteria break down dead organic matter in the ecosystem. So-called "good" bacteria act as beneficial symbionts to almost all animals by filling a variety of roles, including protection against harmful bacteria.
Bile Salts.
extracellular digestion
Blue whales have bacteria in their intestines to aid digestion.
Bacteria
Bacteria in the gut play a major role in digestion. In some cases, the bacteria consume the food and transform it into a form the body can digest. This happens with the digestion of celery.
lactobacillus
Digestion - and its all mammals.
in single celled bacteria.