Digestive bacteria and humans - Human beings have what is often called "good" bacteria in their digestive systems. This "good" bacteria exists in order to help the human to digest food
Some foods cannot be digested entirely: so, when these foods are consumed, the bacteria
in the digestive system feed on those foods.
The bacteria stay alive.
The human gets help with the process of digestion.
predation
mutualism
competition
commensalism

1. seamount a raised footwall block between normal fault creates this 2. syncline break between rocks where a hanging wall rises relative to a footwall 3. hot spring on rolling hills, this a dip between hills 4. volcanic neck created when a block with hanging walls slips down between normal faults 5. caldera underwater volcano that never reaches above sea level 6. horst natural hot water on earth's surface containing many minerals 7. graben underwater volcano whose top is eroded flat by waves 8. crater less than a mile in diameter; looks like a bowl at the top of a volcano 9. guyot magma that filled the central vent that remains after the volcano has eroded 10. reverse fault over 1 mile in diameter; looks like a bowl over a volcano